40=100-2q

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Solution for 40=100-2q equation: 



40=100-2q

We move all terms to the left:

40-(100-2q)=0

We add all the numbers together, and all the variables

-(-2q+100)+40=0

We get rid of parentheses

2q-100+40=0

We add all the numbers together, and all the variables

2q-60=0

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

2q=60

q=60/2

q=30

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