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Simplifying 7x + 3(-3x + -16) = -66 Reorder the terms: 7x + 3(-16 + -3x) = -66 7x + (-16 * 3 + -3x * 3) = -66 7x + (-48 + -9x) = -66 Reorder the terms: -48 + 7x + -9x = -66 Combine like terms: 7x + -9x = -2x -48 + -2x = -66 Solving -48 + -2x = -66 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '48' to each side of the equation. -48 + 48 + -2x = -66 + 48 Combine like terms: -48 + 48 = 0 0 + -2x = -66 + 48 -2x = -66 + 48 Combine like terms: -66 + 48 = -18 -2x = -18 Divide each side by '-2'. x = 9 Simplifying x = 9
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