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140=6x+7x+10
We move all terms to the left:
140-(6x+7x+10)=0
We add all the numbers together, and all the variables
-(13x+10)+140=0
We get rid of parentheses
-13x-10+140=0
We add all the numbers together, and all the variables
-13x+130=0
We move all terms containing x to the left, all other terms to the right
-13x=-130
x=-130/-13
x=+10
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