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90+(-x)+52+(-x)+52=180
We move all terms to the left:
90+(-x)+52+(-x)+52-(180)=0
We add all the numbers together, and all the variables
(-1x)+(-1x)+90+52+52-180=0
We add all the numbers together, and all the variables
(-1x)+(-1x)+14=0
We get rid of parentheses
-1x-1x+14=0
We add all the numbers together, and all the variables
-2x+14=0
We move all terms containing x to the left, all other terms to the right
-2x=-14
x=-14/-2
x=+7
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