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Simplifying 3x + 4(x + -12) = 15 Reorder the terms: 3x + 4(-12 + x) = 15 3x + (-12 * 4 + x * 4) = 15 3x + (-48 + 4x) = 15 Reorder the terms: -48 + 3x + 4x = 15 Combine like terms: 3x + 4x = 7x -48 + 7x = 15 Solving -48 + 7x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '48' to each side of the equation. -48 + 48 + 7x = 15 + 48 Combine like terms: -48 + 48 = 0 0 + 7x = 15 + 48 7x = 15 + 48 Combine like terms: 15 + 48 = 63 7x = 63 Divide each side by '7'. x = 9 Simplifying x = 9
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