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Simplifying 21 + -1(4x) = 9 Remove parenthesis around (4x) 21 + -1 * 4x = 9 Multiply -1 * 4 21 + -4x = 9 Solving 21 + -4x = 9 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 + -4x = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -4x = 9 + -21 -4x = 9 + -21 Combine like terms: 9 + -21 = -12 -4x = -12 Divide each side by '-4'. x = 3 Simplifying x = 3
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