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140-4x=180-8x
We move all terms to the left:
140-4x-(180-8x)=0
We add all the numbers together, and all the variables
-4x-(-8x+180)+140=0
We get rid of parentheses
-4x+8x-180+140=0
We add all the numbers together, and all the variables
4x-40=0
We move all terms containing x to the left, all other terms to the right
4x=40
x=40/4
x=10
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