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Simplifying (4x + 30) + (2x + 15) + 90 = 45 Reorder the terms: (30 + 4x) + (2x + 15) + 90 = 45 Remove parenthesis around (30 + 4x) 30 + 4x + (2x + 15) + 90 = 45 Reorder the terms: 30 + 4x + (15 + 2x) + 90 = 45 Remove parenthesis around (15 + 2x) 30 + 4x + 15 + 2x + 90 = 45 Reorder the terms: 30 + 15 + 90 + 4x + 2x = 45 Combine like terms: 30 + 15 = 45 45 + 90 + 4x + 2x = 45 Combine like terms: 45 + 90 = 135 135 + 4x + 2x = 45 Combine like terms: 4x + 2x = 6x 135 + 6x = 45 Solving 135 + 6x = 45 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-135' to each side of the equation. 135 + -135 + 6x = 45 + -135 Combine like terms: 135 + -135 = 0 0 + 6x = 45 + -135 6x = 45 + -135 Combine like terms: 45 + -135 = -90 6x = -90 Divide each side by '6'. x = -15 Simplifying x = -15
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