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Simplifying -7 + 8x = x + 3x + -15 Reorder the terms: -7 + 8x = -15 + x + 3x Combine like terms: x + 3x = 4x -7 + 8x = -15 + 4x Solving -7 + 8x = -15 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -7 + 8x + -4x = -15 + 4x + -4x Combine like terms: 8x + -4x = 4x -7 + 4x = -15 + 4x + -4x Combine like terms: 4x + -4x = 0 -7 + 4x = -15 + 0 -7 + 4x = -15 Add '7' to each side of the equation. -7 + 7 + 4x = -15 + 7 Combine like terms: -7 + 7 = 0 0 + 4x = -15 + 7 4x = -15 + 7 Combine like terms: -15 + 7 = -8 4x = -8 Divide each side by '4'. x = -2 Simplifying x = -2
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