4+1r+21=7

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Solution for 4+1r+21=7 equation: 


Simplifying
4 + 1r + 21 = 7

Reorder the terms:
4 + 21 + 1r = 7

Combine like terms: 4 + 21 = 25
25 + 1r = 7

Solving
25 + 1r = 7

Solving for variable 'r'.

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

Add '-25' to each side of the equation.
25 + -25 + 1r = 7 + -25

Combine like terms: 25 + -25 = 0
0 + 1r = 7 + -25
1r = 7 + -25

Combine like terms: 7 + -25 = -18
1r = -18

Divide each side by '1'.
r = -18

Simplifying
r = -18

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