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Simplifying 7x + -4(x + -4) + 20 = 25 Reorder the terms: 7x + -4(-4 + x) + 20 = 25 7x + (-4 * -4 + x * -4) + 20 = 25 7x + (16 + -4x) + 20 = 25 Reorder the terms: 16 + 20 + 7x + -4x = 25 Combine like terms: 16 + 20 = 36 36 + 7x + -4x = 25 Combine like terms: 7x + -4x = 3x 36 + 3x = 25 Solving 36 + 3x = 25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + 3x = 25 + -36 Combine like terms: 36 + -36 = 0 0 + 3x = 25 + -36 3x = 25 + -36 Combine like terms: 25 + -36 = -11 3x = -11 Divide each side by '3'. x = -3.666666667 Simplifying x = -3.666666667
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