Solve for x
x=87
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x+3=\frac{9}{0.1}
Divide both sides by 0.1.
x+3=90
Expand \frac{9}{0.1} by multiplying both numerator and the denominator by 10. Anything divided by one gives itself.
x=90-3
Subtract 3 from both sides.
x=87
Subtract 3 from 90 to get 87.
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