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63=(x-7.5)+(x-12)+(x)
We move all terms to the left:
63-((x-7.5)+(x-12)+(x))=0
We calculate terms in parentheses: -((x-7.5)+(x-12)+x), so:We get rid of parentheses
(x-7.5)+(x-12)+x
We add all the numbers together, and all the variables
x+(x-7.5)+(x-12)
We get rid of parentheses
x+x+x-7.5-12
We add all the numbers together, and all the variables
3x-19.5
Back to the equation:
-(3x-19.5)
-3x+19.5+63=0
We add all the numbers together, and all the variables
-3x+82.5=0
We move all terms containing x to the left, all other terms to the right
-3x=-82.5
x=-82.5/-3
x=27+1/2
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