Solve for x
x=120
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8400\times 40=x\times 2800
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 8400x, the least common multiple of x,8400.
336000=x\times 2800
Multiply 8400 and 40 to get 336000.
x\times 2800=336000
Swap sides so that all variable terms are on the left hand side.
x=\frac{336000}{2800}
Divide both sides by 2800.
x=120
Divide 336000 by 2800 to get 120.
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