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Simplifying 66 = 4x + -2(-2x + 15) Reorder the terms: 66 = 4x + -2(15 + -2x) 66 = 4x + (15 * -2 + -2x * -2) 66 = 4x + (-30 + 4x) Reorder the terms: 66 = -30 + 4x + 4x Combine like terms: 4x + 4x = 8x 66 = -30 + 8x Solving 66 = -30 + 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 = -30 + 8x + -8x Combine like terms: 8x + -8x = 0 66 + -8x = -30 + 0 66 + -8x = -30 Add '-66' to each side of the equation. 66 + -66 + -8x = -30 + -66 Combine like terms: 66 + -66 = 0 0 + -8x = -30 + -66 -8x = -30 + -66 Combine like terms: -30 + -66 = -96 -8x = -96 Divide each side by '-8'. x = 12 Simplifying x = 12
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