18=30-r*30

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Solution for 18=30-r*30 equation:


Simplifying
18 = 30 + -1r * 30

Reorder the terms for easier multiplication:
18 = 30 + -1 * 30r

Multiply -1 * 30
18 = 30 + -30r

Solving
18 = 30 + -30r

Solving for variable 'r'.

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

Add '30r' to each side of the equation.
18 + 30r = 30 + -30r + 30r

Combine like terms: -30r + 30r = 0
18 + 30r = 30 + 0
18 + 30r = 30

Add '-18' to each side of the equation.
18 + -18 + 30r = 30 + -18

Combine like terms: 18 + -18 = 0
0 + 30r = 30 + -18
30r = 30 + -18

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

Divide each side by '30'.
r = 0.4

Simplifying
r = 0.4

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