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51=-3x+3(6x-13)
We move all terms to the left:
51-(-3x+3(6x-13))=0
We calculate terms in parentheses: -(-3x+3(6x-13)), so:We get rid of parentheses
-3x+3(6x-13)
We multiply parentheses
-3x+18x-39
We add all the numbers together, and all the variables
15x-39
Back to the equation:
-(15x-39)
-15x+39+51=0
We add all the numbers together, and all the variables
-15x+90=0
We move all terms containing x to the left, all other terms to the right
-15x=-90
x=-90/-15
x=+6
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