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-2b+2b-20=20+10b
We simplify the equation to the form, which is simple to understand
-2b+2b-20=20+10b
We move all terms containing b to the left and all other terms to the right.
-2b+2b-10b=+20+20
We simplify left and right side of the equation.
-10b=+40
We divide both sides of the equation by -10 to get b.
b=-4
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