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136=45x+23x
We move all terms to the left:
136-(45x+23x)=0
We add all the numbers together, and all the variables
-(+68x)+136=0
We get rid of parentheses
-68x+136=0
We move all terms containing x to the left, all other terms to the right
-68x=-136
x=-136/-68
x=+2
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