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2x+1=90+3x+4-180
We move all terms to the left:
2x+1-(90+3x+4-180)=0
We add all the numbers together, and all the variables
2x-(3x-86)+1=0
We get rid of parentheses
2x-3x+86+1=0
We add all the numbers together, and all the variables
-1x+87=0
We move all terms containing x to the left, all other terms to the right
-x=-87
x=-87/-1
x=+87
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