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Simplifying 7x + -13 = 4x + -21 Reorder the terms: -13 + 7x = 4x + -21 Reorder the terms: -13 + 7x = -21 + 4x Solving -13 + 7x = -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. -13 + 7x + -4x = -21 + 4x + -4x Combine like terms: 7x + -4x = 3x -13 + 3x = -21 + 4x + -4x Combine like terms: 4x + -4x = 0 -13 + 3x = -21 + 0 -13 + 3x = -21 Add '13' to each side of the equation. -13 + 13 + 3x = -21 + 13 Combine like terms: -13 + 13 = 0 0 + 3x = -21 + 13 3x = -21 + 13 Combine like terms: -21 + 13 = -8 3x = -8 Divide each side by '3'. x = -2.666666667 Simplifying x = -2.666666667
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