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136=7x+7x-4
We move all terms to the left:
136-(7x+7x-4)=0
We add all the numbers together, and all the variables
-(14x-4)+136=0
We get rid of parentheses
-14x+4+136=0
We add all the numbers together, and all the variables
-14x+140=0
We move all terms containing x to the left, all other terms to the right
-14x=-140
x=-140/-14
x=+10
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