5(r+9)-8(r+5)=-13

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Solution for 5(r+9)-8(r+5)=-13 equation:


Simplifying
5(r + 9) + -8(r + 5) = -13

Reorder the terms:
5(9 + r) + -8(r + 5) = -13
(9 * 5 + r * 5) + -8(r + 5) = -13
(45 + 5r) + -8(r + 5) = -13

Reorder the terms:
45 + 5r + -8(5 + r) = -13
45 + 5r + (5 * -8 + r * -8) = -13
45 + 5r + (-40 + -8r) = -13

Reorder the terms:
45 + -40 + 5r + -8r = -13

Combine like terms: 45 + -40 = 5
5 + 5r + -8r = -13

Combine like terms: 5r + -8r = -3r
5 + -3r = -13

Solving
5 + -3r = -13

Solving for variable 'r'.

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

Add '-5' to each side of the equation.
5 + -5 + -3r = -13 + -5

Combine like terms: 5 + -5 = 0
0 + -3r = -13 + -5
-3r = -13 + -5

Combine like terms: -13 + -5 = -18
-3r = -18

Divide each side by '-3'.
r = 6

Simplifying
r = 6

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