-2+7(3r+8)=117

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Solution for -2+7(3r+8)=117 equation: 


Simplifying
-2 + 7(3r + 8) = 117

Reorder the terms:
-2 + 7(8 + 3r) = 117
-2 + (8 * 7 + 3r * 7) = 117
-2 + (56 + 21r) = 117

Combine like terms: -2 + 56 = 54
54 + 21r = 117

Solving
54 + 21r = 117

Solving for variable 'r'.

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

Add '-54' to each side of the equation.
54 + -54 + 21r = 117 + -54

Combine like terms: 54 + -54 = 0
0 + 21r = 117 + -54
21r = 117 + -54

Combine like terms: 117 + -54 = 63
21r = 63

Divide each side by '21'.
r = 3

Simplifying
r = 3

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