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Simplifying -20 + -7x = 2(3 + 3x) -20 + -7x = (3 * 2 + 3x * 2) -20 + -7x = (6 + 6x) Solving -20 + -7x = 6 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. -20 + -7x + -6x = 6 + 6x + -6x Combine like terms: -7x + -6x = -13x -20 + -13x = 6 + 6x + -6x Combine like terms: 6x + -6x = 0 -20 + -13x = 6 + 0 -20 + -13x = 6 Add '20' to each side of the equation. -20 + 20 + -13x = 6 + 20 Combine like terms: -20 + 20 = 0 0 + -13x = 6 + 20 -13x = 6 + 20 Combine like terms: 6 + 20 = 26 -13x = 26 Divide each side by '-13'. x = -2 Simplifying x = -2
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