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Simplifying -66 = 7x + 3(-5x + 2) Reorder the terms: -66 = 7x + 3(2 + -5x) -66 = 7x + (2 * 3 + -5x * 3) -66 = 7x + (6 + -15x) Reorder the terms: -66 = 6 + 7x + -15x Combine like terms: 7x + -15x = -8x -66 = 6 + -8x Solving -66 = 6 + -8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8x' to each side of the equation. -66 + 8x = 6 + -8x + 8x Combine like terms: -8x + 8x = 0 -66 + 8x = 6 + 0 -66 + 8x = 6 Add '66' to each side of the equation. -66 + 66 + 8x = 6 + 66 Combine like terms: -66 + 66 = 0 0 + 8x = 6 + 66 8x = 6 + 66 Combine like terms: 6 + 66 = 72 8x = 72 Divide each side by '8'. x = 9 Simplifying x = 9
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