15=1+7(X-18)

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Solution for 15=1+7(X-18) equation:


Simplifying
15 = 1 + 7(X + -18)

Reorder the terms:
15 = 1 + 7(-18 + X)
15 = 1 + (-18 * 7 + X * 7)
15 = 1 + (-126 + 7X)

Combine like terms: 1 + -126 = -125
15 = -125 + 7X

Solving
15 = -125 + 7X

Solving for variable 'X'.

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

Add '-7X' to each side of the equation.
15 + -7X = -125 + 7X + -7X

Combine like terms: 7X + -7X = 0
15 + -7X = -125 + 0
15 + -7X = -125

Add '-15' to each side of the equation.
15 + -15 + -7X = -125 + -15

Combine like terms: 15 + -15 = 0
0 + -7X = -125 + -15
-7X = -125 + -15

Combine like terms: -125 + -15 = -140
-7X = -140

Divide each side by '-7'.
X = 20

Simplifying
X = 20

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