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(4x-1)+3x+90=80
We move all terms to the left:
(4x-1)+3x+90-(80)=0
We add all the numbers together, and all the variables
3x+(4x-1)+10=0
We get rid of parentheses
3x+4x-1+10=0
We add all the numbers together, and all the variables
7x+9=0
We move all terms containing x to the left, all other terms to the right
7x=-9
x=-9/7
x=-1+2/7
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