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Simplifying 3x + -7 = 4x + -21 Reorder the terms: -7 + 3x = 4x + -21 Reorder the terms: -7 + 3x = -21 + 4x Solving -7 + 3x = -21 + 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 + 3x + -4x = -21 + 4x + -4x Combine like terms: 3x + -4x = -1x -7 + -1x = -21 + 4x + -4x Combine like terms: 4x + -4x = 0 -7 + -1x = -21 + 0 -7 + -1x = -21 Add '7' to each side of the equation. -7 + 7 + -1x = -21 + 7 Combine like terms: -7 + 7 = 0 0 + -1x = -21 + 7 -1x = -21 + 7 Combine like terms: -21 + 7 = -14 -1x = -14 Divide each side by '-1'. x = 14 Simplifying x = 14
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