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90=49+x
We move all terms to the left:
90-(49+x)=0
We add all the numbers together, and all the variables
-(x+49)+90=0
We get rid of parentheses
-x-49+90=0
We add all the numbers together, and all the variables
-1x+41=0
We move all terms containing x to the left, all other terms to the right
-x=-41
x=-41/-1
x=+41
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