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390\left(-\frac{5z}{6}-\frac{13}{6}\right)+234\left(\frac{2z}{13}+\frac{49}{13}\right)+312z=-78
Multiply both sides of the equation by 78, the least common multiple of 6,13.
390\times \frac{-5z-13}{6}+234\left(\frac{2z}{13}+\frac{49}{13}\right)+312z=-78
Since -\frac{5z}{6} and \frac{13}{6} have the same denominator, subtract them by subtracting their numerators.
65\left(-5z-13\right)+234\left(\frac{2z}{13}+\frac{49}{13}\right)+312z=-78
Cancel out 6, the greatest common factor in 390 and 6.
-325z-845+234\left(\frac{2z}{13}+\frac{49}{13}\right)+312z=-78
Use the distributive property to multiply 65 by -5z-13.
-325z-845+234\times \frac{2z+49}{13}+312z=-78
Since \frac{2z}{13} and \frac{49}{13} have the same denominator, add them by adding their numerators.
-325z-845+18\left(2z+49\right)+312z=-78
Cancel out 13, the greatest common factor in 234 and 13.
-325z-845+36z+882+312z=-78
Use the distributive property to multiply 18 by 2z+49.
-289z-845+882+312z=-78
Combine -325z and 36z to get -289z.
-289z+37+312z=-78
Add -845 and 882 to get 37.
23z+37=-78
Combine -289z and 312z to get 23z.
23z=-78-37
Subtract 37 from both sides.
23z=-115
Subtract 37 from -78 to get -115.
z=\frac{-115}{23}
Divide both sides by 23.
z=-5
Divide -115 by 23 to get -5.