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485\times 232=42\times 0.9x
Multiply both sides of the equation by 81480, the least common multiple of 168,1940.
112520=42\times 0.9x
Multiply 485 and 232 to get 112520.
112520=37.8x
Multiply 42 and 0.9 to get 37.8.
37.8x=112520
Swap sides so that all variable terms are on the left hand side.
x=\frac{112520}{37.8}
Divide both sides by 37.8.
x=\frac{1125200}{378}
Expand \frac{112520}{37.8} by multiplying both numerator and the denominator by 10.
x=\frac{562600}{189}
Reduce the fraction \frac{1125200}{378} to lowest terms by extracting and canceling out 2.