3r-20=4r+8-21

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Solution for 3r-20=4r+8-21 equation:


Simplifying
3r + -20 = 4r + 8 + -21

Reorder the terms:
-20 + 3r = 4r + 8 + -21

Reorder the terms:
-20 + 3r = 8 + -21 + 4r

Combine like terms: 8 + -21 = -13
-20 + 3r = -13 + 4r

Solving
-20 + 3r = -13 + 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.
-20 + 3r + -4r = -13 + 4r + -4r

Combine like terms: 3r + -4r = -1r
-20 + -1r = -13 + 4r + -4r

Combine like terms: 4r + -4r = 0
-20 + -1r = -13 + 0
-20 + -1r = -13

Add '20' to each side of the equation.
-20 + 20 + -1r = -13 + 20

Combine like terms: -20 + 20 = 0
0 + -1r = -13 + 20
-1r = -13 + 20

Combine like terms: -13 + 20 = 7
-1r = 7

Divide each side by '-1'.
r = -7

Simplifying
r = -7

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