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x+15=4x+50=90
We move all terms to the left:
x+15-(4x+50)=0
We get rid of parentheses
x-4x-50+15=0
We add all the numbers together, and all the variables
-3x-35=0
We move all terms containing x to the left, all other terms to the right
-3x=35
x=35/-3
x=-11+2/3
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