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Simplifying 7 + -1(4x + -5) = 21 Reorder the terms: 7 + -1(-5 + 4x) = 21 7 + (-5 * -1 + 4x * -1) = 21 7 + (5 + -4x) = 21 Combine like terms: 7 + 5 = 12 12 + -4x = 21 Solving 12 + -4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -4x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + -4x = 21 + -12 -4x = 21 + -12 Combine like terms: 21 + -12 = 9 -4x = 9 Divide each side by '-4'. x = -2.25 Simplifying x = -2.25
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