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Simplifying 4(2 + -1x) + -1(8 + x) = 21 (2 * 4 + -1x * 4) + -1(8 + x) = 21 (8 + -4x) + -1(8 + x) = 21 8 + -4x + (8 * -1 + x * -1) = 21 8 + -4x + (-8 + -1x) = 21 Reorder the terms: 8 + -8 + -4x + -1x = 21 Combine like terms: 8 + -8 = 0 0 + -4x + -1x = 21 -4x + -1x = 21 Combine like terms: -4x + -1x = -5x -5x = 21 Solving -5x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-5'. x = -4.2 Simplifying x = -4.2
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