7r-13=-40+4r

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Solution for 7r-13=-40+4r equation:


Simplifying
7r + -13 = -40 + 4r

Reorder the terms:
-13 + 7r = -40 + 4r

Solving
-13 + 7r = -40 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
-13 + 7r + -4r = -40 + 4r + -4r

Combine like terms: 7r + -4r = 3r
-13 + 3r = -40 + 4r + -4r

Combine like terms: 4r + -4r = 0
-13 + 3r = -40 + 0
-13 + 3r = -40

Add '13' to each side of the equation.
-13 + 13 + 3r = -40 + 13

Combine like terms: -13 + 13 = 0
0 + 3r = -40 + 13
3r = -40 + 13

Combine like terms: -40 + 13 = -27
3r = -27

Divide each side by '3'.
r = -9

Simplifying
r = -9

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