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Simplifying 7(3x + 1) = 5x + -9x Reorder the terms: 7(1 + 3x) = 5x + -9x (1 * 7 + 3x * 7) = 5x + -9x (7 + 21x) = 5x + -9x Combine like terms: 5x + -9x = -4x 7 + 21x = -4x Solving 7 + 21x = -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 7 + 21x + 4x = -4x + 4x Combine like terms: 21x + 4x = 25x 7 + 25x = -4x + 4x Combine like terms: -4x + 4x = 0 7 + 25x = 0 Add '-7' to each side of the equation. 7 + -7 + 25x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 25x = 0 + -7 25x = 0 + -7 Combine like terms: 0 + -7 = -7 25x = -7 Divide each side by '25'. x = -0.28 Simplifying x = -0.28
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