7r-8.4=2(5r+9)

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Solution for 7r-8.4=2(5r+9) equation:


Simplifying
7r + -8.4 = 2(5r + 9)

Reorder the terms:
-8.4 + 7r = 2(5r + 9)

Reorder the terms:
-8.4 + 7r = 2(9 + 5r)
-8.4 + 7r = (9 * 2 + 5r * 2)
-8.4 + 7r = (18 + 10r)

Solving
-8.4 + 7r = 18 + 10r

Solving for variable 'r'.

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

Add '-10r' to each side of the equation.
-8.4 + 7r + -10r = 18 + 10r + -10r

Combine like terms: 7r + -10r = -3r
-8.4 + -3r = 18 + 10r + -10r

Combine like terms: 10r + -10r = 0
-8.4 + -3r = 18 + 0
-8.4 + -3r = 18

Add '8.4' to each side of the equation.
-8.4 + 8.4 + -3r = 18 + 8.4

Combine like terms: -8.4 + 8.4 = 0.0
0.0 + -3r = 18 + 8.4
-3r = 18 + 8.4

Combine like terms: 18 + 8.4 = 26.4
-3r = 26.4

Divide each side by '-3'.
r = -8.8

Simplifying
r = -8.8

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