3r-8=7r+12

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Solution for 3r-8=7r+12 equation:


Simplifying
3r + -8 = 7r + 12

Reorder the terms:
-8 + 3r = 7r + 12

Reorder the terms:
-8 + 3r = 12 + 7r

Solving
-8 + 3r = 12 + 7r

Solving for variable 'r'.

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

Add '-7r' to each side of the equation.
-8 + 3r + -7r = 12 + 7r + -7r

Combine like terms: 3r + -7r = -4r
-8 + -4r = 12 + 7r + -7r

Combine like terms: 7r + -7r = 0
-8 + -4r = 12 + 0
-8 + -4r = 12

Add '8' to each side of the equation.
-8 + 8 + -4r = 12 + 8

Combine like terms: -8 + 8 = 0
0 + -4r = 12 + 8
-4r = 12 + 8

Combine like terms: 12 + 8 = 20
-4r = 20

Divide each side by '-4'.
r = -5

Simplifying
r = -5

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