7r-3(r-7)+8(s-7)=

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Solution for 7r-3(r-7)+8(s-7)= equation:


Simplifying
7r + -3(r + -7) + 8(s + -7) = 0

Reorder the terms:
7r + -3(-7 + r) + 8(s + -7) = 0
7r + (-7 * -3 + r * -3) + 8(s + -7) = 0
7r + (21 + -3r) + 8(s + -7) = 0

Reorder the terms:
7r + 21 + -3r + 8(-7 + s) = 0
7r + 21 + -3r + (-7 * 8 + s * 8) = 0
7r + 21 + -3r + (-56 + 8s) = 0

Reorder the terms:
21 + -56 + 7r + -3r + 8s = 0

Combine like terms: 21 + -56 = -35
-35 + 7r + -3r + 8s = 0

Combine like terms: 7r + -3r = 4r
-35 + 4r + 8s = 0

Solving
-35 + 4r + 8s = 0

Solving for variable 'r'.

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

Add '35' to each side of the equation.
-35 + 4r + 35 + 8s = 0 + 35

Reorder the terms:
-35 + 35 + 4r + 8s = 0 + 35

Combine like terms: -35 + 35 = 0
0 + 4r + 8s = 0 + 35
4r + 8s = 0 + 35

Combine like terms: 0 + 35 = 35
4r + 8s = 35

Add '-8s' to each side of the equation.
4r + 8s + -8s = 35 + -8s

Combine like terms: 8s + -8s = 0
4r + 0 = 35 + -8s
4r = 35 + -8s

Divide each side by '4'.
r = 8.75 + -2s

Simplifying
r = 8.75 + -2s

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