4(r-5)=8r-(4r-20)

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Solution for 4(r-5)=8r-(4r-20) equation: 


Simplifying
4(r + -5) = 8r + -1(4r + -20)

Reorder the terms:
4(-5 + r) = 8r + -1(4r + -20)
(-5 * 4 + r * 4) = 8r + -1(4r + -20)
(-20 + 4r) = 8r + -1(4r + -20)

Reorder the terms:
-20 + 4r = 8r + -1(-20 + 4r)
-20 + 4r = 8r + (-20 * -1 + 4r * -1)
-20 + 4r = 8r + (20 + -4r)

Reorder the terms:
-20 + 4r = 20 + 8r + -4r

Combine like terms: 8r + -4r = 4r
-20 + 4r = 20 + 4r

Add '-4r' to each side of the equation.
-20 + 4r + -4r = 20 + 4r + -4r

Combine like terms: 4r + -4r = 0
-20 + 0 = 20 + 4r + -4r
-20 = 20 + 4r + -4r

Combine like terms: 4r + -4r = 0
-20 = 20 + 0
-20 = 20

Solving
-20 = 20

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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