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140+x+15=15x+15
We move all terms to the left:
140+x+15-(15x+15)=0
We add all the numbers together, and all the variables
x-(15x+15)+155=0
We get rid of parentheses
x-15x-15+155=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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