-13=-18-r

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Solution for -13=-18-r equation:


Simplifying
-13 = -18 + -1r

Solving
-13 = -18 + -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
-13 + r = -18 + -1r + r

Combine like terms: -1r + r = 0
-13 + r = -18 + 0
-13 + r = -18

Add '13' to each side of the equation.
-13 + 13 + r = -18 + 13

Combine like terms: -13 + 13 = 0
0 + r = -18 + 13
r = -18 + 13

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

Simplifying
r = -5

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