43-2r=21

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Solution for 43-2r=21 equation: 


Simplifying
43 + -2r = 21

Solving
43 + -2r = 21

Solving for variable 'r'.

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

Add '-43' to each side of the equation.
43 + -43 + -2r = 21 + -43

Combine like terms: 43 + -43 = 0
0 + -2r = 21 + -43
-2r = 21 + -43

Combine like terms: 21 + -43 = -22
-2r = -22

Divide each side by '-2'.
r = 11

Simplifying
r = 11

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