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54+x-7=4(x-7)
We move all terms to the left:
54+x-7-(4(x-7))=0
We add all the numbers together, and all the variables
x-(4(x-7))+47=0
We calculate terms in parentheses: -(4(x-7)), so:We get rid of parentheses
4(x-7)
We multiply parentheses
4x-28
Back to the equation:
-(4x-28)
x-4x+28+47=0
We add all the numbers together, and all the variables
-3x+75=0
We move all terms containing x to the left, all other terms to the right
-3x=-75
x=-75/-3
x=+25
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