525=6r+3(r-20)

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Solution for 525=6r+3(r-20) equation:


Simplifying
525 = 6r + 3(r + -20)

Reorder the terms:
525 = 6r + 3(-20 + r)
525 = 6r + (-20 * 3 + r * 3)
525 = 6r + (-60 + 3r)

Reorder the terms:
525 = -60 + 6r + 3r

Combine like terms: 6r + 3r = 9r
525 = -60 + 9r

Solving
525 = -60 + 9r

Solving for variable 'r'.

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

Add '-9r' to each side of the equation.
525 + -9r = -60 + 9r + -9r

Combine like terms: 9r + -9r = 0
525 + -9r = -60 + 0
525 + -9r = -60

Add '-525' to each side of the equation.
525 + -525 + -9r = -60 + -525

Combine like terms: 525 + -525 = 0
0 + -9r = -60 + -525
-9r = -60 + -525

Combine like terms: -60 + -525 = -585
-9r = -585

Divide each side by '-9'.
r = 65

Simplifying
r = 65

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