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40+90+(54+x)=180
We move all terms to the left:
40+90+(54+x)-(180)=0
We add all the numbers together, and all the variables
(x+54)+40+90-180=0
We add all the numbers together, and all the variables
(x+54)-50=0
We get rid of parentheses
x+54-50=0
We add all the numbers together, and all the variables
x+4=0
We move all terms containing x to the left, all other terms to the right
x=-4
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