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1200=x\times \frac{1200}{1.5}+x\times 10
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by x.
1200=x\times \frac{12000}{15}+x\times 10
Expand \frac{1200}{1.5} by multiplying both numerator and the denominator by 10.
1200=x\times 800+x\times 10
Divide 12000 by 15 to get 800.
1200=810x
Combine x\times 800 and x\times 10 to get 810x.
810x=1200
Swap sides so that all variable terms are on the left hand side.
x=\frac{1200}{810}
Divide both sides by 810.
x=\frac{40}{27}
Reduce the fraction \frac{1200}{810} to lowest terms by extracting and canceling out 30.