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Simplifying 5x + 3(7x + 4) = 7x + -9 Reorder the terms: 5x + 3(4 + 7x) = 7x + -9 5x + (4 * 3 + 7x * 3) = 7x + -9 5x + (12 + 21x) = 7x + -9 Reorder the terms: 12 + 5x + 21x = 7x + -9 Combine like terms: 5x + 21x = 26x 12 + 26x = 7x + -9 Reorder the terms: 12 + 26x = -9 + 7x Solving 12 + 26x = -9 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 12 + 26x + -7x = -9 + 7x + -7x Combine like terms: 26x + -7x = 19x 12 + 19x = -9 + 7x + -7x Combine like terms: 7x + -7x = 0 12 + 19x = -9 + 0 12 + 19x = -9 Add '-12' to each side of the equation. 12 + -12 + 19x = -9 + -12 Combine like terms: 12 + -12 = 0 0 + 19x = -9 + -12 19x = -9 + -12 Combine like terms: -9 + -12 = -21 19x = -21 Divide each side by '19'. x = -1.105263158 Simplifying x = -1.105263158
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