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Simplifying -66 = -6x + 2(5x + -15) Reorder the terms: -66 = -6x + 2(-15 + 5x) -66 = -6x + (-15 * 2 + 5x * 2) -66 = -6x + (-30 + 10x) Reorder the terms: -66 = -30 + -6x + 10x Combine like terms: -6x + 10x = 4x -66 = -30 + 4x Solving -66 = -30 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -66 + -4x = -30 + 4x + -4x Combine like terms: 4x + -4x = 0 -66 + -4x = -30 + 0 -66 + -4x = -30 Add '66' to each side of the equation. -66 + 66 + -4x = -30 + 66 Combine like terms: -66 + 66 = 0 0 + -4x = -30 + 66 -4x = -30 + 66 Combine like terms: -30 + 66 = 36 -4x = 36 Divide each side by '-4'. x = -9 Simplifying x = -9
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