13-r=-3(-r+1)

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Solution for 13-r=-3(-r+1) equation:


Simplifying
13 + -1r = -3(-1r + 1)

Reorder the terms:
13 + -1r = -3(1 + -1r)
13 + -1r = (1 * -3 + -1r * -3)
13 + -1r = (-3 + 3r)

Solving
13 + -1r = -3 + 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.
13 + -1r + -3r = -3 + 3r + -3r

Combine like terms: -1r + -3r = -4r
13 + -4r = -3 + 3r + -3r

Combine like terms: 3r + -3r = 0
13 + -4r = -3 + 0
13 + -4r = -3

Add '-13' to each side of the equation.
13 + -13 + -4r = -3 + -13

Combine like terms: 13 + -13 = 0
0 + -4r = -3 + -13
-4r = -3 + -13

Combine like terms: -3 + -13 = -16
-4r = -16

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

Simplifying
r = 4

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