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-7b+7-5=-7b+2
We simplify the equation to the form, which is simple to understand
-7b+7-5=-7b+2
We move all terms containing b to the left and all other terms to the right.
-7b+7b=+2-7+5
We simplify left and right side of the equation.
b=0
0=0
This equation is an identity, so all real numbers are solutions.
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