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Simplifying -20 = 6x + 7x + -7 Reorder the terms: -20 = -7 + 6x + 7x Combine like terms: 6x + 7x = 13x -20 = -7 + 13x Solving -20 = -7 + 13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13x' to each side of the equation. -20 + -13x = -7 + 13x + -13x Combine like terms: 13x + -13x = 0 -20 + -13x = -7 + 0 -20 + -13x = -7 Add '20' to each side of the equation. -20 + 20 + -13x = -7 + 20 Combine like terms: -20 + 20 = 0 0 + -13x = -7 + 20 -13x = -7 + 20 Combine like terms: -7 + 20 = 13 -13x = 13 Divide each side by '-13'. x = -1 Simplifying x = -1
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