10=30-2r

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Solution for 10=30-2r equation:


Simplifying
10 = 30 + -2r

Solving
10 = 30 + -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.
10 + 2r = 30 + -2r + 2r

Combine like terms: -2r + 2r = 0
10 + 2r = 30 + 0
10 + 2r = 30

Add '-10' to each side of the equation.
10 + -10 + 2r = 30 + -10

Combine like terms: 10 + -10 = 0
0 + 2r = 30 + -10
2r = 30 + -10

Combine like terms: 30 + -10 = 20
2r = 20

Divide each side by '2'.
r = 10

Simplifying
r = 10

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