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(5x-18)-5x=(3x+42)-5x
We move all terms to the left:
(5x-18)-5x-((3x+42)-5x)=0
We add all the numbers together, and all the variables
-5x+(5x-18)-((3x+42)-5x)=0
We get rid of parentheses
-5x+5x-((3x+42)-5x)-18=0
We calculate terms in parentheses: -((3x+42)-5x), so:We add all the numbers together, and all the variables
(3x+42)-5x
We add all the numbers together, and all the variables
-5x+(3x+42)
We get rid of parentheses
-5x+3x+42
We add all the numbers together, and all the variables
-2x+42
Back to the equation:
-(-2x+42)
-(-2x+42)-18=0
We get rid of parentheses
2x-42-18=0
We add all the numbers together, and all the variables
2x-60=0
We move all terms containing x to the left, all other terms to the right
2x=60
x=60/2
x=30
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