300+90-x=45

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Solution for 300+90-x=45 equation:


Simplifying
300 + 90 + -1x = 45

Combine like terms: 300 + 90 = 390
390 + -1x = 45

Solving
390 + -1x = 45

Solving for variable 'x'.

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

Add '-390' to each side of the equation.
390 + -390 + -1x = 45 + -390

Combine like terms: 390 + -390 = 0
0 + -1x = 45 + -390
-1x = 45 + -390

Combine like terms: 45 + -390 = -345
-1x = -345

Divide each side by '-1'.
x = 345

Simplifying
x = 345

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