Solve for x
x=400
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x\times 30=100\times 120
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 100x, the least common multiple of 100,x.
x\times 30=12000
Multiply 100 and 120 to get 12000.
x=\frac{12000}{30}
Divide both sides by 30.
x=400
Divide 12000 by 30 to get 400.
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