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Simplifying 12 + -3(11 + -6x) = 87 12 + (11 * -3 + -6x * -3) = 87 12 + (-33 + 18x) = 87 Combine like terms: 12 + -33 = -21 -21 + 18x = 87 Solving -21 + 18x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 18x = 87 + 21 Combine like terms: -21 + 21 = 0 0 + 18x = 87 + 21 18x = 87 + 21 Combine like terms: 87 + 21 = 108 18x = 108 Divide each side by '18'. x = 6 Simplifying x = 6
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