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Simplifying -90 = -7x + 3(-3x + 18) Reorder the terms: -90 = -7x + 3(18 + -3x) -90 = -7x + (18 * 3 + -3x * 3) -90 = -7x + (54 + -9x) Reorder the terms: -90 = 54 + -7x + -9x Combine like terms: -7x + -9x = -16x -90 = 54 + -16x Solving -90 = 54 + -16x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '16x' to each side of the equation. -90 + 16x = 54 + -16x + 16x Combine like terms: -16x + 16x = 0 -90 + 16x = 54 + 0 -90 + 16x = 54 Add '90' to each side of the equation. -90 + 90 + 16x = 54 + 90 Combine like terms: -90 + 90 = 0 0 + 16x = 54 + 90 16x = 54 + 90 Combine like terms: 54 + 90 = 144 16x = 144 Divide each side by '16'. x = 9 Simplifying x = 9
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