25(r-2)=320(r-4)

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Solution for 25(r-2)=320(r-4) equation:


Simplifying
25(r + -2) = 320(r + -4)

Reorder the terms:
25(-2 + r) = 320(r + -4)
(-2 * 25 + r * 25) = 320(r + -4)
(-50 + 25r) = 320(r + -4)

Reorder the terms:
-50 + 25r = 320(-4 + r)
-50 + 25r = (-4 * 320 + r * 320)
-50 + 25r = (-1280 + 320r)

Solving
-50 + 25r = -1280 + 320r

Solving for variable 'r'.

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

Add '-320r' to each side of the equation.
-50 + 25r + -320r = -1280 + 320r + -320r

Combine like terms: 25r + -320r = -295r
-50 + -295r = -1280 + 320r + -320r

Combine like terms: 320r + -320r = 0
-50 + -295r = -1280 + 0
-50 + -295r = -1280

Add '50' to each side of the equation.
-50 + 50 + -295r = -1280 + 50

Combine like terms: -50 + 50 = 0
0 + -295r = -1280 + 50
-295r = -1280 + 50

Combine like terms: -1280 + 50 = -1230
-295r = -1230

Divide each side by '-295'.
r = 4.169491525

Simplifying
r = 4.169491525

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