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Q: 3x plus 4x equals 84 7x equals 84?

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No, that's not correct.-3x + 4x = x

-3x=-21+4x-3x-4x=-21+4x-4x-7x=-217x=217x/7=21/7x=3

7x = 3x - 12 4x=-12 x=-3

7x + 16 = 3x + 4 4x = -12 x = -3

4x+9 = 7x+3 4x-7x = 3-9 -3x = -6 x = 2

8+7x = 20+3x 7x-3x = 20-8 4x = 12 x = 3

3x+5=7x-11 5=4x-11 4x=16 x=4

7x - 2 = 4x + 9 3x - 2 = 9 3x = 11 x = 11/3

-4x

4x

3x + (-2 + 4x) = -2 + 7x

4x+6-7x+9=18-3x+15=18-3x=3x=-1

3x + 4x = 7x

7x - 9 = 3x + 5 7x - 3x - 9 = 5 7x - 3x = 5 + 9 4x = 14 x = 14/4

7x-3=3x+8 7x-3x=8+3 4x=11 x=11/4=2.75

3x = 7 - 4x 3x + 4x = 7 - 4x + 4x 7x = 7 7x/7 = 7/7 x = 1

combine like terms. 3x+1+4x-5=31 3x+4x=7x 7x+1-5=31 1-5=-4 7x-4=31 then solve it 7x=35 x=5

3x = 7-4x 3x+4x = 7 7x = 7 x = 1

3x+4-7x=5-4x+2 -4x+4=7-4x Adding 4x to each side yields: 4=7, which is not true, so there is no answer (a null set)

4x-2y+3x+2y When simplified: 7x

3x - 7 + 4x = 28 7x - 7 = 28 I added 4x and 3x to get 7x 7x = 35 I subtracted 7 from both sides x = 5 I divided by 7 on both sides

7x+2 = 3x-2 7x-3x = -2-2 4x = -4 x = -1

If: 4x+3x = 35Then: 7x = 35So: x = 35/7 => x = 5

Presumably this is an equation in which the value of x is to be found. 7x+8 = 4x-10 7x-4x = -10-8 3x = -18 x = -6

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