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Simplifying 7(x + 7) + -4(9 + x) = 12 Reorder the terms: 7(7 + x) + -4(9 + x) = 12 (7 * 7 + x * 7) + -4(9 + x) = 12 (49 + 7x) + -4(9 + x) = 12 49 + 7x + (9 * -4 + x * -4) = 12 49 + 7x + (-36 + -4x) = 12 Reorder the terms: 49 + -36 + 7x + -4x = 12 Combine like terms: 49 + -36 = 13 13 + 7x + -4x = 12 Combine like terms: 7x + -4x = 3x 13 + 3x = 12 Solving 13 + 3x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 3x = 12 + -13 Combine like terms: 13 + -13 = 0 0 + 3x = 12 + -13 3x = 12 + -13 Combine like terms: 12 + -13 = -1 3x = -1 Divide each side by '3'. x = -0.3333333333 Simplifying x = -0.3333333333
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