30-r=2(6+r)

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Solution for 30-r=2(6+r) equation: 


Simplifying
30 + -1r = 2(6 + r)
30 + -1r = (6 * 2 + r * 2)
30 + -1r = (12 + 2r)

Solving
30 + -1r = 12 + 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
30 + -1r + -2r = 12 + 2r + -2r

Combine like terms: -1r + -2r = -3r
30 + -3r = 12 + 2r + -2r

Combine like terms: 2r + -2r = 0
30 + -3r = 12 + 0
30 + -3r = 12

Add '-30' to each side of the equation.
30 + -30 + -3r = 12 + -30

Combine like terms: 30 + -30 = 0
0 + -3r = 12 + -30
-3r = 12 + -30

Combine like terms: 12 + -30 = -18
-3r = -18

Divide each side by '-3'.
r = 6

Simplifying
r = 6

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