20b-15=18b-7

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Solution for 20b-15=18b-7 equation: 



20b-15=18b-7

We move all terms to the left:

20b-15-(18b-7)=0

We get rid of parentheses

20b-18b+7-15=0

We add all the numbers together, and all the variables

2b-8=0

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

2b=8

b=8/2

b=4

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