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Simplifying -4(s + -7) + 12 = 20 Reorder the terms: -4(-7 + s) + 12 = 20 (-7 * -4 + s * -4) + 12 = 20 (28 + -4s) + 12 = 20 Reorder the terms: 28 + 12 + -4s = 20 Combine like terms: 28 + 12 = 40 40 + -4s = 20 Solving 40 + -4s = 20 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + -4s = 20 + -40 Combine like terms: 40 + -40 = 0 0 + -4s = 20 + -40 -4s = 20 + -40 Combine like terms: 20 + -40 = -20 -4s = -20 Divide each side by '-4'. s = 5 Simplifying s = 5
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