220=10(10-3a)

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Solution for 220=10(10-3a) equation: 



220=10(10-3a)

We move all terms to the left:

220-(10(10-3a))=0

We add all the numbers together, and all the variables

-(10(-3a+10))+220=0



We calculate terms in parentheses: -(10(-3a+10)), so:

10(-3a+10)

We multiply parentheses

-30a+100

Back to the equation:

-(-30a+100)



We get rid of parentheses

30a-100+220=0

We add all the numbers together, and all the variables

30a+120=0

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

30a=-120

a=-120/30

a=-4

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