-13=r-7

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Solution for -13=r-7 equation:


Simplifying
-13 = r + -7

Reorder the terms:
-13 = -7 + r

Solving
-13 = -7 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
-13 + -1r = -7 + r + -1r

Combine like terms: r + -1r = 0
-13 + -1r = -7 + 0
-13 + -1r = -7

Add '13' to each side of the equation.
-13 + 13 + -1r = -7 + 13

Combine like terms: -13 + 13 = 0
0 + -1r = -7 + 13
-1r = -7 + 13

Combine like terms: -7 + 13 = 6
-1r = 6

Divide each side by '-1'.
r = -6

Simplifying
r = -6

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