7(r+3s)-2(2r-9s)=

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Solution for 7(r+3s)-2(2r-9s)= equation:


Simplifying
7(r + 3s) + -2(2r + -9s) = 0
(r * 7 + 3s * 7) + -2(2r + -9s) = 0
(7r + 21s) + -2(2r + -9s) = 0
7r + 21s + (2r * -2 + -9s * -2) = 0
7r + 21s + (-4r + 18s) = 0

Reorder the terms:
7r + -4r + 21s + 18s = 0

Combine like terms: 7r + -4r = 3r
3r + 21s + 18s = 0

Combine like terms: 21s + 18s = 39s
3r + 39s = 0

Solving
3r + 39s = 0

Solving for variable 'r'.

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

Add '-39s' to each side of the equation.
3r + 39s + -39s = 0 + -39s

Combine like terms: 39s + -39s = 0
3r + 0 = 0 + -39s
3r = 0 + -39s
Remove the zero:
3r = -39s

Divide each side by '3'.
r = -13s

Simplifying
r = -13s

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