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140=4+8x
We move all terms to the left:
140-(4+8x)=0
We add all the numbers together, and all the variables
-(8x+4)+140=0
We get rid of parentheses
-8x-4+140=0
We add all the numbers together, and all the variables
-8x+136=0
We move all terms containing x to the left, all other terms to the right
-8x=-136
x=-136/-8
x=+17
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