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5(6x+9)=255
We move all terms to the left:
5(6x+9)-(255)=0
We multiply parentheses
30x+45-255=0
We add all the numbers together, and all the variables
30x-210=0
We move all terms containing x to the left, all other terms to the right
30x=210
x=210/30
x=7
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