136=0.8(220-a)

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Solution for 136=0.8(220-a) equation: 



136=0.8(220-a)

We move all terms to the left:

136-(0.8(220-a))=0

We add all the numbers together, and all the variables

-(0.8(-1a+220))+136=0



We calculate terms in parentheses: -(0.8(-1a+220)), so:

0.8(-1a+220)

We multiply parentheses

-0.8a+176

Back to the equation:

-(-0.8a+176)



We get rid of parentheses

0.8a-176+136=0

We add all the numbers together, and all the variables

0.8a-40=0

We move all terms containing a to the left, all other terms to the right

0.8a=40

a=40/0.8

a=50

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