Solve for x
x = \frac{90}{7} = 12\frac{6}{7} \approx 12.857142857
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10x-3x=90
Multiply both sides of the equation by 30, the least common multiple of 3,10.
7x=90
Combine 10x and -3x to get 7x.
x=\frac{90}{7}
Divide both sides by 7.
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