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(246+m)-72=643
We simplify the equation to the form, which is simple to understand
(246+m)-72=643
Remove unnecessary parentheses
246+m-72=643
We move all terms containing m to the left and all other terms to the right.
+1m=+643-246+72
We simplify left and right side of the equation.
+1m=+469
We divide both sides of the equation by 1 to get m.
m=469
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