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(900+3)(34+21)=x
We move all terms to the left:
(900+3)(34+21)-(x)=0
We add all the numbers together, and all the variables
-x+90355=0
We add all the numbers together, and all the variables
-1x+90355=0
We move all terms containing x to the left, all other terms to the right
-x=-90355
x=-90355/-1
x=+90355
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