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Solving a proportion of the form (x + a)/b = c/d

Demonstrating why we can "cross muliply" a proportion to solve it, we then do that.

From  Tom Grant 18 plays 0  

Multiplicative property of equality with fractions

Multiplying both sides of an euqation with fractions by the reciprocal of the coefficient that is with the variable.

From  Tom Grant 36 plays 0