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Simplifying 90 = 7x + 2(3x + -7) Reorder the terms: 90 = 7x + 2(-7 + 3x) 90 = 7x + (-7 * 2 + 3x * 2) 90 = 7x + (-14 + 6x) Reorder the terms: 90 = -14 + 7x + 6x Combine like terms: 7x + 6x = 13x 90 = -14 + 13x Solving 90 = -14 + 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. 90 + -13x = -14 + 13x + -13x Combine like terms: 13x + -13x = 0 90 + -13x = -14 + 0 90 + -13x = -14 Add '-90' to each side of the equation. 90 + -90 + -13x = -14 + -90 Combine like terms: 90 + -90 = 0 0 + -13x = -14 + -90 -13x = -14 + -90 Combine like terms: -14 + -90 = -104 -13x = -104 Divide each side by '-13'. x = 8 Simplifying x = 8
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