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Simplifying 7x + -1(3x + 11) = 21 Reorder the terms: 7x + -1(11 + 3x) = 21 7x + (11 * -1 + 3x * -1) = 21 7x + (-11 + -3x) = 21 Reorder the terms: -11 + 7x + -3x = 21 Combine like terms: 7x + -3x = 4x -11 + 4x = 21 Solving -11 + 4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + 4x = 21 + 11 Combine like terms: -11 + 11 = 0 0 + 4x = 21 + 11 4x = 21 + 11 Combine like terms: 21 + 11 = 32 4x = 32 Divide each side by '4'. x = 8 Simplifying x = 8
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