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b=-15/10
We move all terms to the left:
b-(-15/10)=0
We get rid of parentheses
b+15/10=0
We multiply all the terms by the denominator
b*10+15=0
Wy multiply elements
10b+15=0
We move all terms containing b to the left, all other terms to the right
10b=-15
b=-15/10
b=-1+1/2
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