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15+x=3x-5
We move all terms to the left:
15+x-(3x-5)=0
We get rid of parentheses
x-3x+5+15=0
We add all the numbers together, and all the variables
-2x+20=0
We move all terms containing x to the left, all other terms to the right
-2x=-20
x=-20/-2
x=+10
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