20=3s-4(30-s)

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Solution for 20=3s-4(30-s) equation:


Simplifying
20 = 3s + -4(30 + -1s)
20 = 3s + (30 * -4 + -1s * -4)
20 = 3s + (-120 + 4s)

Reorder the terms:
20 = -120 + 3s + 4s

Combine like terms: 3s + 4s = 7s
20 = -120 + 7s

Solving
20 = -120 + 7s

Solving for variable 's'.

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

Add '-7s' to each side of the equation.
20 + -7s = -120 + 7s + -7s

Combine like terms: 7s + -7s = 0
20 + -7s = -120 + 0
20 + -7s = -120

Add '-20' to each side of the equation.
20 + -20 + -7s = -120 + -20

Combine like terms: 20 + -20 = 0
0 + -7s = -120 + -20
-7s = -120 + -20

Combine like terms: -120 + -20 = -140
-7s = -140

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

Simplifying
s = 20

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