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13=-1+7m+7
We simplify the equation to the form, which is simple to understand
13=-1+7m+7
We move all terms containing m to the left and all other terms to the right.
-7m=-1+7-13
We simplify left and right side of the equation.
-7m=-7
We divide both sides of the equation by -07 to get m.
m=1
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