100+4r=20+2r+-5

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Solution for 100+4r=20+2r+-5 equation:


Simplifying
100 + 4r = 20 + 2r + -5

Reorder the terms:
100 + 4r = 20 + -5 + 2r

Combine like terms: 20 + -5 = 15
100 + 4r = 15 + 2r

Solving
100 + 4r = 15 + 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
100 + 4r + -2r = 15 + 2r + -2r

Combine like terms: 4r + -2r = 2r
100 + 2r = 15 + 2r + -2r

Combine like terms: 2r + -2r = 0
100 + 2r = 15 + 0
100 + 2r = 15

Add '-100' to each side of the equation.
100 + -100 + 2r = 15 + -100

Combine like terms: 100 + -100 = 0
0 + 2r = 15 + -100
2r = 15 + -100

Combine like terms: 15 + -100 = -85
2r = -85

Divide each side by '2'.
r = -42.5

Simplifying
r = -42.5

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