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x+2x=1.56\times 2
Multiply both sides by 2.
3x=1.56\times 2
Combine x and 2x to get 3x.
3x=3.12
Multiply 1.56 and 2 to get 3.12.
x=\frac{3.12}{3}
Divide both sides by 3.
x=\frac{312}{300}
Expand \frac{3.12}{3} by multiplying both numerator and the denominator by 100.
x=\frac{26}{25}
Reduce the fraction \frac{312}{300} to lowest terms by extracting and canceling out 12.