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Simplifying 4(x + 5) = 7x + -1 Reorder the terms: 4(5 + x) = 7x + -1 (5 * 4 + x * 4) = 7x + -1 (20 + 4x) = 7x + -1 Reorder the terms: 20 + 4x = -1 + 7x Solving 20 + 4x = -1 + 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. 20 + 4x + -7x = -1 + 7x + -7x Combine like terms: 4x + -7x = -3x 20 + -3x = -1 + 7x + -7x Combine like terms: 7x + -7x = 0 20 + -3x = -1 + 0 20 + -3x = -1 Add '-20' to each side of the equation. 20 + -20 + -3x = -1 + -20 Combine like terms: 20 + -20 = 0 0 + -3x = -1 + -20 -3x = -1 + -20 Combine like terms: -1 + -20 = -21 -3x = -21 Divide each side by '-3'. x = 7 Simplifying x = 7
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