(3r+1)-(9r+7)=

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Solution for (3r+1)-(9r+7)= equation:


Simplifying
(3r + 1) + -1(9r + 7) = 0

Reorder the terms:
(1 + 3r) + -1(9r + 7) = 0

Remove parenthesis around (1 + 3r)
1 + 3r + -1(9r + 7) = 0

Reorder the terms:
1 + 3r + -1(7 + 9r) = 0
1 + 3r + (7 * -1 + 9r * -1) = 0
1 + 3r + (-7 + -9r) = 0

Reorder the terms:
1 + -7 + 3r + -9r = 0

Combine like terms: 1 + -7 = -6
-6 + 3r + -9r = 0

Combine like terms: 3r + -9r = -6r
-6 + -6r = 0

Solving
-6 + -6r = 0

Solving for variable 'r'.

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

Add '6' to each side of the equation.
-6 + 6 + -6r = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -6r = 0 + 6
-6r = 0 + 6

Combine like terms: 0 + 6 = 6
-6r = 6

Divide each side by '-6'.
r = -1

Simplifying
r = -1

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