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0.5(15-x*5)=21
We move all terms to the left:
0.5(15-x*5)-(21)=0
We add all the numbers together, and all the variables
0.5(-x*5+15)-21=0
We multiply parentheses
-2.5x+7.5-21=0
We add all the numbers together, and all the variables
-2.5x-13.5=0
We move all terms containing x to the left, all other terms to the right
-2.5x=13.5
x=13.5/-2.5
x=-5+1/2.5
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