3r-20=7r

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Solution for 3r-20=7r equation:


Simplifying
3r + -20 = 7r

Reorder the terms:
-20 + 3r = 7r

Solving
-20 + 3r = 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.
-20 + 3r + -7r = 7r + -7r

Combine like terms: 3r + -7r = -4r
-20 + -4r = 7r + -7r

Combine like terms: 7r + -7r = 0
-20 + -4r = 0

Add '20' to each side of the equation.
-20 + 20 + -4r = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -4r = 0 + 20
-4r = 0 + 20

Combine like terms: 0 + 20 = 20
-4r = 20

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

Simplifying
r = -5

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