4s+12=3(2s-1)+21

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Solution for 4s+12=3(2s-1)+21 equation: 


Simplifying
4s + 12 = 3(2s + -1) + 21

Reorder the terms:
12 + 4s = 3(2s + -1) + 21

Reorder the terms:
12 + 4s = 3(-1 + 2s) + 21
12 + 4s = (-1 * 3 + 2s * 3) + 21
12 + 4s = (-3 + 6s) + 21

Reorder the terms:
12 + 4s = -3 + 21 + 6s

Combine like terms: -3 + 21 = 18
12 + 4s = 18 + 6s

Solving
12 + 4s = 18 + 6s

Solving for variable 's'.

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

Add '-6s' to each side of the equation.
12 + 4s + -6s = 18 + 6s + -6s

Combine like terms: 4s + -6s = -2s
12 + -2s = 18 + 6s + -6s

Combine like terms: 6s + -6s = 0
12 + -2s = 18 + 0
12 + -2s = 18

Add '-12' to each side of the equation.
12 + -12 + -2s = 18 + -12

Combine like terms: 12 + -12 = 0
0 + -2s = 18 + -12
-2s = 18 + -12

Combine like terms: 18 + -12 = 6
-2s = 6

Divide each side by '-2'.
s = -3

Simplifying
s = -3

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