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448.81=220+0.87x
We move all terms to the left:
448.81-(220+0.87x)=0
We add all the numbers together, and all the variables
-(0.87x+220)+448.81=0
We get rid of parentheses
-0.87x-220+448.81=0
We add all the numbers together, and all the variables
-0.87x+228.81=0
We move all terms containing x to the left, all other terms to the right
-0.87x=-228.81
x=-228.81/-0.87
x=+263
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