3+9r-1=7r+12-3r

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Solution for 3+9r-1=7r+12-3r equation:


Simplifying
3 + 9r + -1 = 7r + 12 + -3r

Reorder the terms:
3 + -1 + 9r = 7r + 12 + -3r

Combine like terms: 3 + -1 = 2
2 + 9r = 7r + 12 + -3r

Reorder the terms:
2 + 9r = 12 + 7r + -3r

Combine like terms: 7r + -3r = 4r
2 + 9r = 12 + 4r

Solving
2 + 9r = 12 + 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.
2 + 9r + -4r = 12 + 4r + -4r

Combine like terms: 9r + -4r = 5r
2 + 5r = 12 + 4r + -4r

Combine like terms: 4r + -4r = 0
2 + 5r = 12 + 0
2 + 5r = 12

Add '-2' to each side of the equation.
2 + -2 + 5r = 12 + -2

Combine like terms: 2 + -2 = 0
0 + 5r = 12 + -2
5r = 12 + -2

Combine like terms: 12 + -2 = 10
5r = 10

Divide each side by '5'.
r = 2

Simplifying
r = 2

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