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-25\left(4\times 6+1\right)-84\left(-\frac{v}{3}\right)=-5\left(3\times 30+7\right)
Multiply both sides of the equation by 150, the least common multiple of 6,25,3,30.
-25\left(24+1\right)-84\left(-\frac{v}{3}\right)=-5\left(3\times 30+7\right)
Multiply 4 and 6 to get 24.
-25\times 25-84\left(-\frac{v}{3}\right)=-5\left(3\times 30+7\right)
Add 24 and 1 to get 25.
-625-84\left(-\frac{v}{3}\right)=-5\left(3\times 30+7\right)
Multiply -25 and 25 to get -625.
-625+84\times \frac{v}{3}=-5\left(3\times 30+7\right)
Multiply -84 and -1 to get 84.
-625+84\times \frac{v}{3}=-5\left(90+7\right)
Multiply 3 and 30 to get 90.
-625+84\times \frac{v}{3}=-5\times 97
Add 90 and 7 to get 97.
-625+84\times \frac{v}{3}=-485
Multiply -5 and 97 to get -485.
-625+28v=-485
Cancel out 3, the greatest common factor in 84 and 3.
28v=-485+625
Add 625 to both sides.
28v=140
Add -485 and 625 to get 140.
v=\frac{140}{28}
Divide both sides by 28.
v=5
Divide 140 by 28 to get 5.