v=4*3.14*r*x+3*3.14*r^2

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Solution for v=4*3.14*r*x+3*3.14*r^2 equation: 


Simplifying
v = 4 * 3.14r * x + 3 * 3.14r2

Multiply 4 * 3.14
v = 12.56r * x + 3 * 3.14r2

Multiply r * x
v = 12.56rx + 3 * 3.14r2

Multiply 3 * 3.14
v = 12.56rx + 9.42r2

Solving
v = 12.56rx + 9.42r2

Solving for variable 'v'.

Move all terms containing v to the left, all other terms to the right.

Simplifying
v = 12.56rx + 9.42r2

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