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Simplifying -7(3x + -4) + -4x = 78 Reorder the terms: -7(-4 + 3x) + -4x = 78 (-4 * -7 + 3x * -7) + -4x = 78 (28 + -21x) + -4x = 78 Combine like terms: -21x + -4x = -25x 28 + -25x = 78 Solving 28 + -25x = 78 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + -25x = 78 + -28 Combine like terms: 28 + -28 = 0 0 + -25x = 78 + -28 -25x = 78 + -28 Combine like terms: 78 + -28 = 50 -25x = 50 Divide each side by '-25'. x = -2 Simplifying x = -2
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