Solve for x
x = \frac{15}{7} = 2\frac{1}{7} \approx 2.142857143
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7x-15=0
Combine 4x and 3x to get 7x.
7x=15
Add 15 to both sides. Anything plus zero gives itself.
x=\frac{15}{7}
Divide both sides by 7.
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