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5x+9x-21=42-7x
We move all terms to the left:
5x+9x-21-(42-7x)=0
We add all the numbers together, and all the variables
5x+9x-(-7x+42)-21=0
We add all the numbers together, and all the variables
14x-(-7x+42)-21=0
We get rid of parentheses
14x+7x-42-21=0
We add all the numbers together, and all the variables
21x-63=0
We move all terms containing x to the left, all other terms to the right
21x=63
x=63/21
x=3
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