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Simplifying 4 + -2(x + 7) = -21 Reorder the terms: 4 + -2(7 + x) = -21 4 + (7 * -2 + x * -2) = -21 4 + (-14 + -2x) = -21 Combine like terms: 4 + -14 = -10 -10 + -2x = -21 Solving -10 + -2x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + -2x = -21 + 10 Combine like terms: -10 + 10 = 0 0 + -2x = -21 + 10 -2x = -21 + 10 Combine like terms: -21 + 10 = -11 -2x = -11 Divide each side by '-2'. x = 5.5 Simplifying x = 5.5
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