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Simplifying 7(x2 + -3x) + -7x2 + 20x = 5 Reorder the terms: 7(-3x + x2) + -7x2 + 20x = 5 (-3x * 7 + x2 * 7) + -7x2 + 20x = 5 (-21x + 7x2) + -7x2 + 20x = 5 Reorder the terms: -21x + 20x + 7x2 + -7x2 = 5 Combine like terms: -21x + 20x = -1x -1x + 7x2 + -7x2 = 5 Combine like terms: 7x2 + -7x2 = 0 -1x + 0 = 5 -1x = 5 Solving -1x = 5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-1'. x = -5 Simplifying x = -5
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