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Simplifying 42x2 + -69x + 20 + -1l = 7x2 + -8 Reorder the terms: 20 + -1l + -69x + 42x2 = 7x2 + -8 Reorder the terms: 20 + -1l + -69x + 42x2 = -8 + 7x2 Solving 20 + -1l + -69x + 42x2 = -8 + 7x2 Solving for variable 'l'. Move all terms containing l to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -1l + -69x + -20 + 42x2 = -8 + -20 + 7x2 Reorder the terms: 20 + -20 + -1l + -69x + 42x2 = -8 + -20 + 7x2 Combine like terms: 20 + -20 = 0 0 + -1l + -69x + 42x2 = -8 + -20 + 7x2 -1l + -69x + 42x2 = -8 + -20 + 7x2 Combine like terms: -8 + -20 = -28 -1l + -69x + 42x2 = -28 + 7x2 Add '69x' to each side of the equation. -1l + -69x + 69x + 42x2 = -28 + 69x + 7x2 Combine like terms: -69x + 69x = 0 -1l + 0 + 42x2 = -28 + 69x + 7x2 -1l + 42x2 = -28 + 69x + 7x2 Add '-42x2' to each side of the equation. -1l + 42x2 + -42x2 = -28 + 69x + 7x2 + -42x2 Combine like terms: 42x2 + -42x2 = 0 -1l + 0 = -28 + 69x + 7x2 + -42x2 -1l = -28 + 69x + 7x2 + -42x2 Combine like terms: 7x2 + -42x2 = -35x2 -1l = -28 + 69x + -35x2 Divide each side by '-1'. l = 28 + -69x + 35x2 Simplifying l = 28 + -69x + 35x2
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