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140=4x+100
We move all terms to the left:
140-(4x+100)=0
We get rid of parentheses
-4x-100+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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