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140-35x=-25x
We move all terms to the left:
140-35x-(-25x)=0
We get rid of parentheses
-35x+25x+140=0
We add all the numbers together, and all the variables
-10x+140=0
We move all terms containing x to the left, all other terms to the right
-10x=-140
x=-140/-10
x=+14
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