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3\left(-7-5x\right)=13+5x
Multiply both sides of the equation by 6, the least common multiple of 2,6.
-21-15x=13+5x
Use the distributive property to multiply 3 by -7-5x.
-21-15x-5x=13
Subtract 5x from both sides.
-21-20x=13
Combine -15x and -5x to get -20x.
-20x=13+21
Add 21 to both sides.
-20x=34
Add 13 and 21 to get 34.
x=\frac{34}{-20}
Divide both sides by -20.
x=-\frac{17}{10}
Reduce the fraction \frac{34}{-20} to lowest terms by extracting and canceling out 2.