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Simplifying 90 = (21x + 12) + (35x + -6) Reorder the terms: 90 = (12 + 21x) + (35x + -6) Remove parenthesis around (12 + 21x) 90 = 12 + 21x + (35x + -6) Reorder the terms: 90 = 12 + 21x + (-6 + 35x) Remove parenthesis around (-6 + 35x) 90 = 12 + 21x + -6 + 35x Reorder the terms: 90 = 12 + -6 + 21x + 35x Combine like terms: 12 + -6 = 6 90 = 6 + 21x + 35x Combine like terms: 21x + 35x = 56x 90 = 6 + 56x Solving 90 = 6 + 56x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-56x' to each side of the equation. 90 + -56x = 6 + 56x + -56x Combine like terms: 56x + -56x = 0 90 + -56x = 6 + 0 90 + -56x = 6 Add '-90' to each side of the equation. 90 + -90 + -56x = 6 + -90 Combine like terms: 90 + -90 = 0 0 + -56x = 6 + -90 -56x = 6 + -90 Combine like terms: 6 + -90 = -84 -56x = -84 Divide each side by '-56'. x = 1.5 Simplifying x = 1.5
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