7(s+3)=45-3(12-a)

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Solution for 7(s+3)=45-3(12-a) equation:


Simplifying
7(s + 3) = 45 + -3(12 + -1a)

Reorder the terms:
7(3 + s) = 45 + -3(12 + -1a)
(3 * 7 + s * 7) = 45 + -3(12 + -1a)
(21 + 7s) = 45 + -3(12 + -1a)
21 + 7s = 45 + (12 * -3 + -1a * -3)
21 + 7s = 45 + (-36 + 3a)

Combine like terms: 45 + -36 = 9
21 + 7s = 9 + 3a

Solving
21 + 7s = 9 + 3a

Solving for variable 's'.

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

Add '-21' to each side of the equation.
21 + -21 + 7s = 9 + -21 + 3a

Combine like terms: 21 + -21 = 0
0 + 7s = 9 + -21 + 3a
7s = 9 + -21 + 3a

Combine like terms: 9 + -21 = -12
7s = -12 + 3a

Divide each side by '7'.
s = -1.714285714 + 0.4285714286a

Simplifying
s = -1.714285714 + 0.4285714286a

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