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Simplifying 4(x + 3) + 3x = -1(5x + -21) + x Reorder the terms: 4(3 + x) + 3x = -1(5x + -21) + x (3 * 4 + x * 4) + 3x = -1(5x + -21) + x (12 + 4x) + 3x = -1(5x + -21) + x Combine like terms: 4x + 3x = 7x 12 + 7x = -1(5x + -21) + x Reorder the terms: 12 + 7x = -1(-21 + 5x) + x 12 + 7x = (-21 * -1 + 5x * -1) + x 12 + 7x = (21 + -5x) + x Combine like terms: -5x + x = -4x 12 + 7x = 21 + -4x Solving 12 + 7x = 21 + -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. 12 + 7x + 4x = 21 + -4x + 4x Combine like terms: 7x + 4x = 11x 12 + 11x = 21 + -4x + 4x Combine like terms: -4x + 4x = 0 12 + 11x = 21 + 0 12 + 11x = 21 Add '-12' to each side of the equation. 12 + -12 + 11x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 11x = 21 + -12 11x = 21 + -12 Combine like terms: 21 + -12 = 9 11x = 9 Divide each side by '11'. x = 0.8181818182 Simplifying x = 0.8181818182
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