-7t+6t-8s-r+12s+4t-6t+5s-r=

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Solution for -7t+6t-8s-r+12s+4t-6t+5s-r= equation:


Simplifying
-7t + 6t + -8s + -1r + 12s + 4t + -6t + 5s + -1r = 0

Reorder the terms:
-1r + -1r + -8s + 12s + 5s + -7t + 6t + 4t + -6t = 0

Combine like terms: -1r + -1r = -2r
-2r + -8s + 12s + 5s + -7t + 6t + 4t + -6t = 0

Combine like terms: -8s + 12s = 4s
-2r + 4s + 5s + -7t + 6t + 4t + -6t = 0

Combine like terms: 4s + 5s = 9s
-2r + 9s + -7t + 6t + 4t + -6t = 0

Combine like terms: -7t + 6t = -1t
-2r + 9s + -1t + 4t + -6t = 0

Combine like terms: -1t + 4t = 3t
-2r + 9s + 3t + -6t = 0

Combine like terms: 3t + -6t = -3t
-2r + 9s + -3t = 0

Solving
-2r + 9s + -3t = 0

Solving for variable 'r'.

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

Add '-9s' to each side of the equation.
-2r + 9s + -9s + -3t = 0 + -9s

Combine like terms: 9s + -9s = 0
-2r + 0 + -3t = 0 + -9s
-2r + -3t = 0 + -9s
Remove the zero:
-2r + -3t = -9s

Add '3t' to each side of the equation.
-2r + -3t + 3t = -9s + 3t

Combine like terms: -3t + 3t = 0
-2r + 0 = -9s + 3t
-2r = -9s + 3t

Divide each side by '-2'.
r = 4.5s + -1.5t

Simplifying
r = 4.5s + -1.5t

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