r+(3r)+(r-1)=9

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Solution for r+(3r)+(r-1)=9 equation:


Simplifying
r + (3r) + (r + -1) = 9

Reorder the terms:
r + (3r) + (-1 + r) = 9

Remove parenthesis around (-1 + r)
r + (3r) + -1 + r = 9

Reorder the terms:
-1 + r + (3r) + r = 9

Combine like terms: r + (3r) = 4r
-1 + 4r + r = 9

Combine like terms: 4r + r = 5r
-1 + 5r = 9

Solving
-1 + 5r = 9

Solving for variable 'r'.

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

Add '1' to each side of the equation.
-1 + 1 + 5r = 9 + 1

Combine like terms: -1 + 1 = 0
0 + 5r = 9 + 1
5r = 9 + 1

Combine like terms: 9 + 1 = 10
5r = 10

Divide each side by '5'.
r = 2

Simplifying
r = 2

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