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4x+2=13x+3=90
We move all terms to the left:
4x+2-(13x+3)=0
We get rid of parentheses
4x-13x-3+2=0
We add all the numbers together, and all the variables
-9x-1=0
We move all terms containing x to the left, all other terms to the right
-9x=1
x=1/-9
x=-1/9
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