(3r+-13)+(r+7)+r=74

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Solution for (3r+-13)+(r+7)+r=74 equation:


Simplifying
(3r + -13) + (r + 7) + r = 74

Reorder the terms:
(-13 + 3r) + (r + 7) + r = 74

Remove parenthesis around (-13 + 3r)
-13 + 3r + (r + 7) + r = 74

Reorder the terms:
-13 + 3r + (7 + r) + r = 74

Remove parenthesis around (7 + r)
-13 + 3r + 7 + r + r = 74

Reorder the terms:
-13 + 7 + 3r + r + r = 74

Combine like terms: -13 + 7 = -6
-6 + 3r + r + r = 74

Combine like terms: 3r + r = 4r
-6 + 4r + r = 74

Combine like terms: 4r + r = 5r
-6 + 5r = 74

Solving
-6 + 5r = 74

Solving for variable 'r'.

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

Add '6' to each side of the equation.
-6 + 6 + 5r = 74 + 6

Combine like terms: -6 + 6 = 0
0 + 5r = 74 + 6
5r = 74 + 6

Combine like terms: 74 + 6 = 80
5r = 80

Divide each side by '5'.
r = 16

Simplifying
r = 16

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