Solve for x
x=3500
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1.12x=420+x
Multiply 1.4 and 0.8 to get 1.12.
1.12x-x=420
Subtract x from both sides.
0.12x=420
Combine 1.12x and -x to get 0.12x.
x=\frac{420}{0.12}
Divide both sides by 0.12.
x=\frac{42000}{12}
Expand \frac{420}{0.12} by multiplying both numerator and the denominator by 100.
x=3500
Divide 42000 by 12 to get 3500.
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