Q: -3x plus 4x equals 7x

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

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

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

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

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

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3x + 4x = 847x = 84divide both sides by 7x = 12

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

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

7x = 3x - 12 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

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

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

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

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