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Simplifying 7x + -5(4x + -3) = 158 Reorder the terms: 7x + -5(-3 + 4x) = 158 7x + (-3 * -5 + 4x * -5) = 158 7x + (15 + -20x) = 158 Reorder the terms: 15 + 7x + -20x = 158 Combine like terms: 7x + -20x = -13x 15 + -13x = 158 Solving 15 + -13x = 158 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -13x = 158 + -15 Combine like terms: 15 + -15 = 0 0 + -13x = 158 + -15 -13x = 158 + -15 Combine like terms: 158 + -15 = 143 -13x = 143 Divide each side by '-13'. x = -11 Simplifying x = -11
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