11-r=8(r-20)

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Solution for 11-r=8(r-20) equation:


Simplifying
11 + -1r = 8(r + -20)

Reorder the terms:
11 + -1r = 8(-20 + r)
11 + -1r = (-20 * 8 + r * 8)
11 + -1r = (-160 + 8r)

Solving
11 + -1r = -160 + 8r

Solving for variable 'r'.

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

Add '-8r' to each side of the equation.
11 + -1r + -8r = -160 + 8r + -8r

Combine like terms: -1r + -8r = -9r
11 + -9r = -160 + 8r + -8r

Combine like terms: 8r + -8r = 0
11 + -9r = -160 + 0
11 + -9r = -160

Add '-11' to each side of the equation.
11 + -11 + -9r = -160 + -11

Combine like terms: 11 + -11 = 0
0 + -9r = -160 + -11
-9r = -160 + -11

Combine like terms: -160 + -11 = -171
-9r = -171

Divide each side by '-9'.
r = 19

Simplifying
r = 19

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