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255=15x+6*(x+4)
We move all terms to the left:
255-(15x+6*(x+4))=0
We calculate terms in parentheses: -(15x+6*(x+4)), so:We get rid of parentheses
15x+6*(x+4)
We multiply parentheses
15x+6x+24
We add all the numbers together, and all the variables
21x+24
Back to the equation:
-(21x+24)
-21x-24+255=0
We add all the numbers together, and all the variables
-21x+231=0
We move all terms containing x to the left, all other terms to the right
-21x=-231
x=-231/-21
x=+11
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