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Simplifying x + -7(2x + 3) = 18 Reorder the terms: x + -7(3 + 2x) = 18 x + (3 * -7 + 2x * -7) = 18 x + (-21 + -14x) = 18 Reorder the terms: -21 + x + -14x = 18 Combine like terms: x + -14x = -13x -21 + -13x = 18 Solving -21 + -13x = 18 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 + -13x = 18 + 21 Combine like terms: -21 + 21 = 0 0 + -13x = 18 + 21 -13x = 18 + 21 Combine like terms: 18 + 21 = 39 -13x = 39 Divide each side by '-13'. x = -3 Simplifying x = -3
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