20=900-8q

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Solution for 20=900-8q equation: 



20=900-8q

We move all terms to the left:

20-(900-8q)=0

We add all the numbers together, and all the variables

-(-8q+900)+20=0

We get rid of parentheses

8q-900+20=0

We add all the numbers together, and all the variables

8q-880=0

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

8q=880

q=880/8

q=110

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