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2b+2b+4b-4b=4
We simplify the equation to the form, which is simple to understand
2b+2b+4b-4b=4
We move all terms containing b to the left and all other terms to the right.
+2b+2b+4b-4b=+4
We simplify left and right side of the equation.
+4b=+4
We divide both sides of the equation by 4 to get b.
b=1
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