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15-3x=10x-50
We move all terms to the left:
15-3x-(10x-50)=0
We get rid of parentheses
-3x-10x+50+15=0
We add all the numbers together, and all the variables
-13x+65=0
We move all terms containing x to the left, all other terms to the right
-13x=-65
x=-65/-13
x=+5
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