390=R-.25R

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Solution for 390=R-.25R equation:


Simplifying
390 = R + -0.25R

Combine like terms: R + -0.25R = 0.75R
390 = 0.75R

Solving
390 = 0.75R

Solving for variable 'R'.

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

Add '-0.75R' to each side of the equation.
390 + -0.75R = 0.75R + -0.75R

Combine like terms: 0.75R + -0.75R = 0.00
390 + -0.75R = 0.00

Add '-390' to each side of the equation.
390 + -390 + -0.75R = 0.00 + -390

Combine like terms: 390 + -390 = 0
0 + -0.75R = 0.00 + -390
-0.75R = 0.00 + -390

Combine like terms: 0.00 + -390 = -390
-0.75R = -390

Divide each side by '-0.75'.
R = 520

Simplifying
R = 520

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