20=10+0.4q

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Solution for 20=10+0.4q equation: 



20=10+0.4q

We move all terms to the left:

20-(10+0.4q)=0

We add all the numbers together, and all the variables

-(0.4q+10)+20=0

We get rid of parentheses

-0.4q-10+20=0

We add all the numbers together, and all the variables

-0.4q+10=0

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

-0.4q=-10

q=-10/-0.4

q=+25

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