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(0.75+15x)12-18=5+7x
We move all terms to the left:
(0.75+15x)12-18-(5+7x)=0
We add all the numbers together, and all the variables
(15x+0.75)12-(7x+5)-18=0
We multiply parentheses
180x-(7x+5)+9-18=0
We get rid of parentheses
180x-7x-5+9-18=0
We add all the numbers together, and all the variables
173x-14=0
We move all terms containing x to the left, all other terms to the right
173x=14
x=14/173
x=14/173
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