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6x+13=4x-3=90
We move all terms to the left:
6x+13-(4x-3)=0
We get rid of parentheses
6x-4x+3+13=0
We add all the numbers together, and all the variables
2x+16=0
We move all terms containing x to the left, all other terms to the right
2x=-16
x=-16/2
x=-8
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