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Simplifying x + -1(4x + -7) = 21 Reorder the terms: x + -1(-7 + 4x) = 21 x + (-7 * -1 + 4x * -1) = 21 x + (7 + -4x) = 21 Reorder the terms: 7 + x + -4x = 21 Combine like terms: x + -4x = -3x 7 + -3x = 21 Solving 7 + -3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -3x = 21 + -7 Combine like terms: 7 + -7 = 0 0 + -3x = 21 + -7 -3x = 21 + -7 Combine like terms: 21 + -7 = 14 -3x = 14 Divide each side by '-3'. x = -4.666666667 Simplifying x = -4.666666667
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