Solve for w
w=7
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w\times 18=21\times 6
Variable w cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 21w, the least common multiple of 21,w.
w\times 18=126
Multiply 21 and 6 to get 126.
w=\frac{126}{18}
Divide both sides by 18.
w=7
Divide 126 by 18 to get 7.
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