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Simplifying -21 = 6 + 4(s + -3) Reorder the terms: -21 = 6 + 4(-3 + s) -21 = 6 + (-3 * 4 + s * 4) -21 = 6 + (-12 + 4s) Combine like terms: 6 + -12 = -6 -21 = -6 + 4s Solving -21 = -6 + 4s Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-4s' to each side of the equation. -21 + -4s = -6 + 4s + -4s Combine like terms: 4s + -4s = 0 -21 + -4s = -6 + 0 -21 + -4s = -6 Add '21' to each side of the equation. -21 + 21 + -4s = -6 + 21 Combine like terms: -21 + 21 = 0 0 + -4s = -6 + 21 -4s = -6 + 21 Combine like terms: -6 + 21 = 15 -4s = 15 Divide each side by '-4'. s = -3.75 Simplifying s = -3.75
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