3x=6x-15 ....
you want to take 6x and put it on the other side of the = sign. To do that you do the opposite. So you would subtract since 6x is a positive number. so then the equation is 3x-6x=-15. 3x-6x = -3x which makes the equation -3x=-15. Then you would take -3 which is being multiplied by x and do the opposite operation on the other side. so -3 divided by -15 equals 5. which makes the equation now x=5. So then 5+8=13
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3x - 8 = 7 so x = 5
7x-3=3x+8 7x-3x=8+3 4x=11 x=11/4=2.75
6x + 6 = 3x - 2 Bring 3x to the left and subtract: 6x - 3x = 3x 3x + 6 = -2 -2 - 6 = -8 -8 / 3 X = -8/3
8-3x = 128 -3x = 128-8 -3x = 120 x = -40
7x + 8 = 10x - 2 ∴ 3x = 10 ∴ x = 10/3