24
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first you have to subtrate 39 on both sides. -x=-24
then to get the value of x, divide each side by negative one. thus your answer is x=24.
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8x+39 = 2x-15 6x = -54 x = -9
42
16
7
x - 15 = - 8 add 15 to both sides: x -15 + 15 = -8 + 15 simplify both sides: x = 7