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(-4x+47)+(10x+31)=90
We move all terms to the left:
(-4x+47)+(10x+31)-(90)=0
We get rid of parentheses
-4x+10x+47+31-90=0
We add all the numbers together, and all the variables
6x-12=0
We move all terms containing x to the left, all other terms to the right
6x=12
x=12/6
x=2
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