9+7r-5=7r+40-4r

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Solution for 9+7r-5=7r+40-4r equation:


Simplifying
9 + 7r + -5 = 7r + 40 + -4r

Reorder the terms:
9 + -5 + 7r = 7r + 40 + -4r

Combine like terms: 9 + -5 = 4
4 + 7r = 7r + 40 + -4r

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

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

Solving
4 + 7r = 40 + 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.
4 + 7r + -3r = 40 + 3r + -3r

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

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

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

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

Combine like terms: 40 + -4 = 36
4r = 36

Divide each side by '4'.
r = 9

Simplifying
r = 9

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