Solve for x
x=400
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40\times 30=3x
Multiply both sides of the equation by 3000, the least common multiple of 75,1000.
1200=3x
Multiply 40 and 30 to get 1200.
3x=1200
Swap sides so that all variable terms are on the left hand side.
x=\frac{1200}{3}
Divide both sides by 3.
x=400
Divide 1200 by 3 to get 400.
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