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(cy^3)(9y^d) = 18y^6
Coefficient c on the left has to be 2 so that when we
multiply it by 9 we'll get the coefficient 18 on the
right side. So we have:
(2y^3)(9y^d) = 18y^6
Exponent d has to be 3 so that when we add the exponents
3 and d of y on the left side, we'll get the exponent of
y on the right side, which is 6. So we have:
(2y^3)(9y^3) = 18y^6
Edwin