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-1=-10+b/21
We simplify the equation to the form, which is simple to understand
-1=-10+b/21
We move all terms containing b to the left and all other terms to the right.
-0.047619047619048b=-10+1
We simplify left and right side of the equation.
-0.047619047619048b=-9
We divide both sides of the equation by -00.047619047619048 to get b.
b=189
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