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Simplifying 4 + -1(3x + 7) = 15 Reorder the terms: 4 + -1(7 + 3x) = 15 4 + (7 * -1 + 3x * -1) = 15 4 + (-7 + -3x) = 15 Combine like terms: 4 + -7 = -3 -3 + -3x = 15 Solving -3 + -3x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -3x = 15 + 3 Combine like terms: -3 + 3 = 0 0 + -3x = 15 + 3 -3x = 15 + 3 Combine like terms: 15 + 3 = 18 -3x = 18 Divide each side by '-3'. x = -6 Simplifying x = -6
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