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Simplifying 4 + 3(2s + -7) + -3(4s + 7) + -9 = 0 Reorder the terms: 4 + 3(-7 + 2s) + -3(4s + 7) + -9 = 0 4 + (-7 * 3 + 2s * 3) + -3(4s + 7) + -9 = 0 4 + (-21 + 6s) + -3(4s + 7) + -9 = 0 Reorder the terms: 4 + -21 + 6s + -3(7 + 4s) + -9 = 0 4 + -21 + 6s + (7 * -3 + 4s * -3) + -9 = 0 4 + -21 + 6s + (-21 + -12s) + -9 = 0 Reorder the terms: 4 + -21 + -21 + -9 + 6s + -12s = 0 Combine like terms: 4 + -21 = -17 -17 + -21 + -9 + 6s + -12s = 0 Combine like terms: -17 + -21 = -38 -38 + -9 + 6s + -12s = 0 Combine like terms: -38 + -9 = -47 -47 + 6s + -12s = 0 Combine like terms: 6s + -12s = -6s -47 + -6s = 0 Solving -47 + -6s = 0 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '47' to each side of the equation. -47 + 47 + -6s = 0 + 47 Combine like terms: -47 + 47 = 0 0 + -6s = 0 + 47 -6s = 0 + 47 Combine like terms: 0 + 47 = 47 -6s = 47 Divide each side by '-6'. s = -7.833333333 Simplifying s = -7.833333333
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