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133=5x+2x
We move all terms to the left:
133-(5x+2x)=0
We add all the numbers together, and all the variables
-(+7x)+133=0
We get rid of parentheses
-7x+133=0
We move all terms containing x to the left, all other terms to the right
-7x=-133
x=-133/-7
x=+19
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