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3\times 26-26\times 4=1.8x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 3x, the least common multiple of x,3x.
78-104=1.8x
Do the multiplications.
-26=1.8x
Subtract 104 from 78 to get -26.
1.8x=-26
Swap sides so that all variable terms are on the left hand side.
x=\frac{-26}{1.8}
Divide both sides by 1.8.
x=\frac{-260}{18}
Expand \frac{-26}{1.8} by multiplying both numerator and the denominator by 10.
x=-\frac{130}{9}
Reduce the fraction \frac{-260}{18} to lowest terms by extracting and canceling out 2.