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18x+2(3x-4x)=45
We move all terms to the left:
18x+2(3x-4x)-(45)=0
We add all the numbers together, and all the variables
18x+2(-1x)-45=0
We multiply parentheses
18x-2x-45=0
We add all the numbers together, and all the variables
16x-45=0
We move all terms containing x to the left, all other terms to the right
16x=45
x=45/16
x=2+13/16
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