30=4r-42

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Solution for 30=4r-42 equation:


Simplifying
30 = 4r + -42

Reorder the terms:
30 = -42 + 4r

Solving
30 = -42 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
30 + -4r = -42 + 4r + -4r

Combine like terms: 4r + -4r = 0
30 + -4r = -42 + 0
30 + -4r = -42

Add '-30' to each side of the equation.
30 + -30 + -4r = -42 + -30

Combine like terms: 30 + -30 = 0
0 + -4r = -42 + -30
-4r = -42 + -30

Combine like terms: -42 + -30 = -72
-4r = -72

Divide each side by '-4'.
r = 18

Simplifying
r = 18

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