Solve for x
x<100
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12x<5400-4200
Subtract 4200 from both sides.
12x<1200
Subtract 4200 from 5400 to get 1200.
x<\frac{1200}{12}
Divide both sides by 12. Since 12 is positive, the inequality direction remains the same.
x<100
Divide 1200 by 12 to get 100.
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