3.5(a-20)=90

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Solution for 3.5(a-20)=90 equation: 



3.5(a-20)=90

We move all terms to the left:

3.5(a-20)-(90)=0

We multiply parentheses

3.5a-70-90=0

We add all the numbers together, and all the variables

3.5a-160=0

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

3.5a=160

a=160/3.5

a=45+2.5/3.5

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