42=18r+4(r+5)

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Solution for 42=18r+4(r+5) equation:


Simplifying
42 = 18r + 4(r + 5)

Reorder the terms:
42 = 18r + 4(5 + r)
42 = 18r + (5 * 4 + r * 4)
42 = 18r + (20 + 4r)

Reorder the terms:
42 = 20 + 18r + 4r

Combine like terms: 18r + 4r = 22r
42 = 20 + 22r

Solving
42 = 20 + 22r

Solving for variable 'r'.

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

Add '-22r' to each side of the equation.
42 + -22r = 20 + 22r + -22r

Combine like terms: 22r + -22r = 0
42 + -22r = 20 + 0
42 + -22r = 20

Add '-42' to each side of the equation.
42 + -42 + -22r = 20 + -42

Combine like terms: 42 + -42 = 0
0 + -22r = 20 + -42
-22r = 20 + -42

Combine like terms: 20 + -42 = -22
-22r = -22

Divide each side by '-22'.
r = 1

Simplifying
r = 1

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