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Simplifying -123 = -7x + -4(3x + -12) Reorder the terms: -123 = -7x + -4(-12 + 3x) -123 = -7x + (-12 * -4 + 3x * -4) -123 = -7x + (48 + -12x) Reorder the terms: -123 = 48 + -7x + -12x Combine like terms: -7x + -12x = -19x -123 = 48 + -19x Solving -123 = 48 + -19x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '19x' to each side of the equation. -123 + 19x = 48 + -19x + 19x Combine like terms: -19x + 19x = 0 -123 + 19x = 48 + 0 -123 + 19x = 48 Add '123' to each side of the equation. -123 + 123 + 19x = 48 + 123 Combine like terms: -123 + 123 = 0 0 + 19x = 48 + 123 19x = 48 + 123 Combine like terms: 48 + 123 = 171 19x = 171 Divide each side by '19'. x = 9 Simplifying x = 9
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