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Simplifying 6x + 3(3x + -7) = 69 Reorder the terms: 6x + 3(-7 + 3x) = 69 6x + (-7 * 3 + 3x * 3) = 69 6x + (-21 + 9x) = 69 Reorder the terms: -21 + 6x + 9x = 69 Combine like terms: 6x + 9x = 15x -21 + 15x = 69 Solving -21 + 15x = 69 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 15x = 69 + 21 Combine like terms: -21 + 21 = 0 0 + 15x = 69 + 21 15x = 69 + 21 Combine like terms: 69 + 21 = 90 15x = 90 Divide each side by '15'. x = 6 Simplifying x = 6
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