-9.9-21.9r=5.1r+4(6.9-2.6)

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Solution for -9.9-21.9r=5.1r+4(6.9-2.6) equation:


Simplifying
-9.9 + -21.9r = 5.1r + 4(6.9 + -2.6)

Combine like terms: 6.9 + -2.6 = 4.3
-9.9 + -21.9r = 5.1r + 4(4.3)

Multiply 4 * 4.3
-9.9 + -21.9r = 5.1r + 17.2

Reorder the terms:
-9.9 + -21.9r = 17.2 + 5.1r

Solving
-9.9 + -21.9r = 17.2 + 5.1r

Solving for variable 'r'.

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

Add '-5.1r' to each side of the equation.
-9.9 + -21.9r + -5.1r = 17.2 + 5.1r + -5.1r

Combine like terms: -21.9r + -5.1r = -27r
-9.9 + -27r = 17.2 + 5.1r + -5.1r

Combine like terms: 5.1r + -5.1r = 0.0
-9.9 + -27r = 17.2 + 0.0
-9.9 + -27r = 17.2

Add '9.9' to each side of the equation.
-9.9 + 9.9 + -27r = 17.2 + 9.9

Combine like terms: -9.9 + 9.9 = 0.0
0.0 + -27r = 17.2 + 9.9
-27r = 17.2 + 9.9

Combine like terms: 17.2 + 9.9 = 27.1
-27r = 27.1

Divide each side by '-27'.
r = -1.003703704

Simplifying
r = -1.003703704

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