7(s+18)=21(s-4)

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Solution for 7(s+18)=21(s-4) equation:


Simplifying
7(s + 18) = 21(s + -4)

Reorder the terms:
7(18 + s) = 21(s + -4)
(18 * 7 + s * 7) = 21(s + -4)
(126 + 7s) = 21(s + -4)

Reorder the terms:
126 + 7s = 21(-4 + s)
126 + 7s = (-4 * 21 + s * 21)
126 + 7s = (-84 + 21s)

Solving
126 + 7s = -84 + 21s

Solving for variable 's'.

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

Add '-21s' to each side of the equation.
126 + 7s + -21s = -84 + 21s + -21s

Combine like terms: 7s + -21s = -14s
126 + -14s = -84 + 21s + -21s

Combine like terms: 21s + -21s = 0
126 + -14s = -84 + 0
126 + -14s = -84

Add '-126' to each side of the equation.
126 + -126 + -14s = -84 + -126

Combine like terms: 126 + -126 = 0
0 + -14s = -84 + -126
-14s = -84 + -126

Combine like terms: -84 + -126 = -210
-14s = -210

Divide each side by '-14'.
s = 15

Simplifying
s = 15

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