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-15=-10+b/4
We move all terms to the left:
-15-(-10+b/4)=0
We add all the numbers together, and all the variables
-(b/4-10)-15=0
We get rid of parentheses
-b/4+10-15=0
We multiply all the terms by the denominator
-b+10*4-15*4=0
We add all the numbers together, and all the variables
-1b-20=0
We move all terms containing b to the left, all other terms to the right
-b=20
b=20/-1
b=-20
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