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138=10x+8
We move all terms to the left:
138-(10x+8)=0
We get rid of parentheses
-10x-8+138=0
We add all the numbers together, and all the variables
-10x+130=0
We move all terms containing x to the left, all other terms to the right
-10x=-130
x=-130/-10
x=+13
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