3(r-1)=9+t

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


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

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

Solving
-3 + 3r = 9 + t

Solving for variable 'r'.

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

Add '3' to each side of the equation.
-3 + 3 + 3r = 9 + 3 + t

Combine like terms: -3 + 3 = 0
0 + 3r = 9 + 3 + t
3r = 9 + 3 + t

Combine like terms: 9 + 3 = 12
3r = 12 + t

Divide each side by '3'.
r = 4 + 0.3333333333t

Simplifying
r = 4 + 0.3333333333t

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