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