5(2r+6)=7r+9

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Solution for 5(2r+6)=7r+9 equation:


Simplifying
5(2r + 6) = 7r + 9

Reorder the terms:
5(6 + 2r) = 7r + 9
(6 * 5 + 2r * 5) = 7r + 9
(30 + 10r) = 7r + 9

Reorder the terms:
30 + 10r = 9 + 7r

Solving
30 + 10r = 9 + 7r

Solving for variable 'r'.

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

Add '-7r' to each side of the equation.
30 + 10r + -7r = 9 + 7r + -7r

Combine like terms: 10r + -7r = 3r
30 + 3r = 9 + 7r + -7r

Combine like terms: 7r + -7r = 0
30 + 3r = 9 + 0
30 + 3r = 9

Add '-30' to each side of the equation.
30 + -30 + 3r = 9 + -30

Combine like terms: 30 + -30 = 0
0 + 3r = 9 + -30
3r = 9 + -30

Combine like terms: 9 + -30 = -21
3r = -21

Divide each side by '3'.
r = -7

Simplifying
r = -7

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