30*13=X-1

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Solution for 30*13=X-1 equation:


Simplifying
30 * 13 = X + -1

Multiply 30 * 13
390 = X + -1

Reorder the terms:
390 = -1 + X

Solving
390 = -1 + X

Solving for variable 'X'.

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

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

Combine like terms: X + -1X = 0
390 + -1X = -1 + 0
390 + -1X = -1

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

Combine like terms: 390 + -390 = 0
0 + -1X = -1 + -390
-1X = -1 + -390

Combine like terms: -1 + -390 = -391
-1X = -391

Divide each side by '-1'.
X = 391

Simplifying
X = 391

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