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140=10x+120
We move all terms to the left:
140-(10x+120)=0
We get rid of parentheses
-10x-120+140=0
We add all the numbers together, and all the variables
-10x+20=0
We move all terms containing x to the left, all other terms to the right
-10x=-20
x=-20/-10
x=+2
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