20=90-3q

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Solution for 20=90-3q equation: 



20=90-3q

We move all terms to the left:

20-(90-3q)=0

We add all the numbers together, and all the variables

-(-3q+90)+20=0

We get rid of parentheses

3q-90+20=0

We add all the numbers together, and all the variables

3q-70=0

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

3q=70

q=70/3

q=23+1/3

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