840=120+45n

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Solution for 840=120+45n equation:


Simplifying
840 = 120 + 45n

Solving
840 = 120 + 45n

Solving for variable 'n'.

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

Add '-45n' to each side of the equation.
840 + -45n = 120 + 45n + -45n

Combine like terms: 45n + -45n = 0
840 + -45n = 120 + 0
840 + -45n = 120

Add '-840' to each side of the equation.
840 + -840 + -45n = 120 + -840

Combine like terms: 840 + -840 = 0
0 + -45n = 120 + -840
-45n = 120 + -840

Combine like terms: 120 + -840 = -720
-45n = -720

Divide each side by '-45'.
n = 16

Simplifying
n = 16

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