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Simplifying -400 = -100 + -20x Solving -400 = -100 + -20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20x' to each side of the equation. -400 + 20x = -100 + -20x + 20x Combine like terms: -20x + 20x = 0 -400 + 20x = -100 + 0 -400 + 20x = -100 Add '400' to each side of the equation. -400 + 400 + 20x = -100 + 400 Combine like terms: -400 + 400 = 0 0 + 20x = -100 + 400 20x = -100 + 400 Combine like terms: -100 + 400 = 300 20x = 300 Divide each side by '20'. x = 15 Simplifying x = 15
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