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21-18x=13x-15-7x
We move all terms to the left:
21-18x-(13x-15-7x)=0
We add all the numbers together, and all the variables
-18x-(6x-15)+21=0
We get rid of parentheses
-18x-6x+15+21=0
We add all the numbers together, and all the variables
-24x+36=0
We move all terms containing x to the left, all other terms to the right
-24x=-36
x=-36/-24
x=1+1/2
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