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3x+10=90-x
We move all terms to the left:
3x+10-(90-x)=0
We add all the numbers together, and all the variables
3x-(-1x+90)+10=0
We get rid of parentheses
3x+1x-90+10=0
We add all the numbers together, and all the variables
4x-80=0
We move all terms containing x to the left, all other terms to the right
4x=80
x=80/4
x=20
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