45=0.13n+.12(n-500)

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Solution for 45=0.13n+.12(n-500) equation:


Simplifying
45 = 0.13n + 0.12(n + -500)

Reorder the terms:
45 = 0.13n + 0.12(-500 + n)
45 = 0.13n + (-500 * 0.12 + n * 0.12)
45 = 0.13n + (-60 + 0.12n)

Reorder the terms:
45 = -60 + 0.13n + 0.12n

Combine like terms: 0.13n + 0.12n = 0.25n
45 = -60 + 0.25n

Solving
45 = -60 + 0.25n

Solving for variable 'n'.

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

Add '-0.25n' to each side of the equation.
45 + -0.25n = -60 + 0.25n + -0.25n

Combine like terms: 0.25n + -0.25n = 0.00
45 + -0.25n = -60 + 0.00
45 + -0.25n = -60

Add '-45' to each side of the equation.
45 + -45 + -0.25n = -60 + -45

Combine like terms: 45 + -45 = 0
0 + -0.25n = -60 + -45
-0.25n = -60 + -45

Combine like terms: -60 + -45 = -105
-0.25n = -105

Divide each side by '-0.25'.
n = 420

Simplifying
n = 420

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