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Simplifying -7x + -21 = -4x + 20 Reorder the terms: -21 + -7x = -4x + 20 Reorder the terms: -21 + -7x = 20 + -4x Solving -21 + -7x = 20 + -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. -21 + -7x + 4x = 20 + -4x + 4x Combine like terms: -7x + 4x = -3x -21 + -3x = 20 + -4x + 4x Combine like terms: -4x + 4x = 0 -21 + -3x = 20 + 0 -21 + -3x = 20 Add '21' to each side of the equation. -21 + 21 + -3x = 20 + 21 Combine like terms: -21 + 21 = 0 0 + -3x = 20 + 21 -3x = 20 + 21 Combine like terms: 20 + 21 = 41 -3x = 41 Divide each side by '-3'. x = -13.66666667 Simplifying x = -13.66666667
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