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Simplifying -7x + 1 + -6x = -90 Reorder the terms: 1 + -7x + -6x = -90 Combine like terms: -7x + -6x = -13x 1 + -13x = -90 Solving 1 + -13x = -90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -13x = -90 + -1 Combine like terms: 1 + -1 = 0 0 + -13x = -90 + -1 -13x = -90 + -1 Combine like terms: -90 + -1 = -91 -13x = -91 Divide each side by '-13'. x = 7 Simplifying x = 7
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