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21.5-4=2.5x
We move all terms to the left:
21.5-4-(2.5x)=0
We add all the numbers together, and all the variables
-(+2.5x)+21.5-4=0
We add all the numbers together, and all the variables
-(+2.5x)+17.5=0
We get rid of parentheses
-2.5x+17.5=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-17.5
x=-17.5/-2.5
x=+7
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