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2b+7+8b=0
We simplify the equation to the form, which is simple to understand
2b+7+8b=0
We move all terms containing b to the left and all other terms to the right.
+2b+8b=0-7
We simplify left and right side of the equation.
+10b=-7
We divide both sides of the equation by 10 to get b.
b=-0.7
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