r+15=3r+7

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Solution for r+15=3r+7 equation:


Simplifying
r + 15 = 3r + 7

Reorder the terms:
15 + r = 3r + 7

Reorder the terms:
15 + r = 7 + 3r

Solving
15 + r = 7 + 3r

Solving for variable 'r'.

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

Add '-3r' to each side of the equation.
15 + r + -3r = 7 + 3r + -3r

Combine like terms: r + -3r = -2r
15 + -2r = 7 + 3r + -3r

Combine like terms: 3r + -3r = 0
15 + -2r = 7 + 0
15 + -2r = 7

Add '-15' to each side of the equation.
15 + -15 + -2r = 7 + -15

Combine like terms: 15 + -15 = 0
0 + -2r = 7 + -15
-2r = 7 + -15

Combine like terms: 7 + -15 = -8
-2r = -8

Divide each side by '-2'.
r = 4

Simplifying
r = 4

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