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180=90+3x+4x-1
We move all terms to the left:
180-(90+3x+4x-1)=0
We add all the numbers together, and all the variables
-(7x+89)+180=0
We get rid of parentheses
-7x-89+180=0
We add all the numbers together, and all the variables
-7x+91=0
We move all terms containing x to the left, all other terms to the right
-7x=-91
x=-91/-7
x=+13
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