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Simplifying 21x + 12(3x + -200) = 1590 Reorder the terms: 21x + 12(-200 + 3x) = 1590 21x + (-200 * 12 + 3x * 12) = 1590 21x + (-2400 + 36x) = 1590 Reorder the terms: -2400 + 21x + 36x = 1590 Combine like terms: 21x + 36x = 57x -2400 + 57x = 1590 Solving -2400 + 57x = 1590 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2400' to each side of the equation. -2400 + 2400 + 57x = 1590 + 2400 Combine like terms: -2400 + 2400 = 0 0 + 57x = 1590 + 2400 57x = 1590 + 2400 Combine like terms: 1590 + 2400 = 3990 57x = 3990 Divide each side by '57'. x = 70 Simplifying x = 70
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