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140=0.8(220-a)
We move all terms to the left:
140-(0.8(220-a))=0
We add all the numbers together, and all the variables
-(0.8(-1a+220))+140=0
We calculate terms in parentheses: -(0.8(-1a+220)), so:We get rid of parentheses
0.8(-1a+220)
We multiply parentheses
-0.8a+176
Back to the equation:
-(-0.8a+176)
0.8a-176+140=0
We add all the numbers together, and all the variables
0.8a-36=0
We move all terms containing a to the left, all other terms to the right
0.8a=36
a=36/0.8
a=45
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