240=20*7+b

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Solution for 240=20*7+b equation: 



240=20*7+b

We move all terms to the left:

240-(20*7+b)=0

We add all the numbers together, and all the variables

-(b+140)+240=0

We get rid of parentheses

-b-140+240=0

We add all the numbers together, and all the variables

-1b+100=0

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

-b=-100

b=-100/-1

b=+100

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