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1800\times 150-100\times 1500=3x\times 125
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 1800x, the least common multiple of x,18x,600.
270000-150000=3x\times 125
Do the multiplications.
120000=3x\times 125
Subtract 150000 from 270000 to get 120000.
120000=375x
Multiply 3 and 125 to get 375.
375x=120000
Swap sides so that all variable terms are on the left hand side.
x=\frac{120000}{375}
Divide both sides by 375.
x=320
Divide 120000 by 375 to get 320.