4r-8-1=7

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Solution for 4r-8-1=7 equation: 


Simplifying
4r + -8 + -1 = 7

Reorder the terms:
-8 + -1 + 4r = 7

Combine like terms: -8 + -1 = -9
-9 + 4r = 7

Solving
-9 + 4r = 7

Solving for variable 'r'.

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

Add '9' to each side of the equation.
-9 + 9 + 4r = 7 + 9

Combine like terms: -9 + 9 = 0
0 + 4r = 7 + 9
4r = 7 + 9

Combine like terms: 7 + 9 = 16
4r = 16

Divide each side by '4'.
r = 4

Simplifying
r = 4

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