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Simplifying 21(3x + 9) = 15x + 90 Reorder the terms: 21(9 + 3x) = 15x + 90 (9 * 21 + 3x * 21) = 15x + 90 (189 + 63x) = 15x + 90 Reorder the terms: 189 + 63x = 90 + 15x Solving 189 + 63x = 90 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. 189 + 63x + -15x = 90 + 15x + -15x Combine like terms: 63x + -15x = 48x 189 + 48x = 90 + 15x + -15x Combine like terms: 15x + -15x = 0 189 + 48x = 90 + 0 189 + 48x = 90 Add '-189' to each side of the equation. 189 + -189 + 48x = 90 + -189 Combine like terms: 189 + -189 = 0 0 + 48x = 90 + -189 48x = 90 + -189 Combine like terms: 90 + -189 = -99 48x = -99 Divide each side by '48'. x = -2.0625 Simplifying x = -2.0625
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