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Simplifying 7x + -2(-4x + -20) = 115 Reorder the terms: 7x + -2(-20 + -4x) = 115 7x + (-20 * -2 + -4x * -2) = 115 7x + (40 + 8x) = 115 Reorder the terms: 40 + 7x + 8x = 115 Combine like terms: 7x + 8x = 15x 40 + 15x = 115 Solving 40 + 15x = 115 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + 15x = 115 + -40 Combine like terms: 40 + -40 = 0 0 + 15x = 115 + -40 15x = 115 + -40 Combine like terms: 115 + -40 = 75 15x = 75 Divide each side by '15'. x = 5 Simplifying x = 5
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