40=3s-4(25-s)

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Solution for 40=3s-4(25-s) equation:


Simplifying
40 = 3s + -4(25 + -1s)
40 = 3s + (25 * -4 + -1s * -4)
40 = 3s + (-100 + 4s)

Reorder the terms:
40 = -100 + 3s + 4s

Combine like terms: 3s + 4s = 7s
40 = -100 + 7s

Solving
40 = -100 + 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.
40 + -7s = -100 + 7s + -7s

Combine like terms: 7s + -7s = 0
40 + -7s = -100 + 0
40 + -7s = -100

Add '-40' to each side of the equation.
40 + -40 + -7s = -100 + -40

Combine like terms: 40 + -40 = 0
0 + -7s = -100 + -40
-7s = -100 + -40

Combine like terms: -100 + -40 = -140
-7s = -140

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

Simplifying
s = 20

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