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10\times 2-30\times 5=30x\times \frac{3}{10}-15\times 3
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 30x, the least common multiple of 3x,x,10,2x.
20-150=30x\times \frac{3}{10}-15\times 3
Do the multiplications.
-130=30x\times \frac{3}{10}-15\times 3
Subtract 150 from 20 to get -130.
-130=9x-15\times 3
Multiply 30 and \frac{3}{10} to get 9.
-130=9x-45
Multiply -15 and 3 to get -45.
9x-45=-130
Swap sides so that all variable terms are on the left hand side.
9x=-130+45
Add 45 to both sides.
9x=-85
Add -130 and 45 to get -85.
x=\frac{-85}{9}
Divide both sides by 9.
x=-\frac{85}{9}
Fraction \frac{-85}{9} can be rewritten as -\frac{85}{9} by extracting the negative sign.