7r+8(r+2)=121

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Solution for 7r+8(r+2)=121 equation:


Simplifying
7r + 8(r + 2) = 121

Reorder the terms:
7r + 8(2 + r) = 121
7r + (2 * 8 + r * 8) = 121
7r + (16 + 8r) = 121

Reorder the terms:
16 + 7r + 8r = 121

Combine like terms: 7r + 8r = 15r
16 + 15r = 121

Solving
16 + 15r = 121

Solving for variable 'r'.

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

Add '-16' to each side of the equation.
16 + -16 + 15r = 121 + -16

Combine like terms: 16 + -16 = 0
0 + 15r = 121 + -16
15r = 121 + -16

Combine like terms: 121 + -16 = 105
15r = 105

Divide each side by '15'.
r = 7

Simplifying
r = 7

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