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2\times 6+2v\left(-\frac{1}{2}\right)=7
Variable v cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 2v, the least common multiple of v,2,2v.
12+2v\left(-\frac{1}{2}\right)=7
Multiply 2 and 6 to get 12.
12-v=7
Multiply 2 and -\frac{1}{2} to get -1.
-v=7-12
Subtract 12 from both sides.
-v=-5
Subtract 12 from 7 to get -5.
v=5
Multiply both sides by -1.