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10-3b-12.5=0
We simplify the equation to the form, which is simple to understand
10-3b-12.5=0
We move all terms containing b to the left and all other terms to the right.
-3b=0-10+12.5
We simplify left and right side of the equation.
-3b=+2.5
We divide both sides of the equation by -3 to get b.
b=-0.83333333333333
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