Solve for x
x=75
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3\times 100=4x
Multiply both sides of the equation by 120, the least common multiple of 40,30.
300=4x
Multiply 3 and 100 to get 300.
4x=300
Swap sides so that all variable terms are on the left hand side.
x=\frac{300}{4}
Divide both sides by 4.
x=75
Divide 300 by 4 to get 75.
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