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Simplifying 90 = -6x + 3(-5x + -12) Reorder the terms: 90 = -6x + 3(-12 + -5x) 90 = -6x + (-12 * 3 + -5x * 3) 90 = -6x + (-36 + -15x) Reorder the terms: 90 = -36 + -6x + -15x Combine like terms: -6x + -15x = -21x 90 = -36 + -21x Solving 90 = -36 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. 90 + 21x = -36 + -21x + 21x Combine like terms: -21x + 21x = 0 90 + 21x = -36 + 0 90 + 21x = -36 Add '-90' to each side of the equation. 90 + -90 + 21x = -36 + -90 Combine like terms: 90 + -90 = 0 0 + 21x = -36 + -90 21x = -36 + -90 Combine like terms: -36 + -90 = -126 21x = -126 Divide each side by '21'. x = -6 Simplifying x = -6
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