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4x-7=-39+8x
We move all terms to the left:
4x-7-(-39+8x)=0
We add all the numbers together, and all the variables
4x-(8x-39)-7=0
We get rid of parentheses
4x-8x+39-7=0
We add all the numbers together, and all the variables
-4x+32=0
We move all terms containing x to the left, all other terms to the right
-4x=-32
x=-32/-4
x=+8
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