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Simplifying 6x + -7 + -2x = 21 + -3x Reorder the terms: -7 + 6x + -2x = 21 + -3x Combine like terms: 6x + -2x = 4x -7 + 4x = 21 + -3x Solving -7 + 4x = 21 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. -7 + 4x + 3x = 21 + -3x + 3x Combine like terms: 4x + 3x = 7x -7 + 7x = 21 + -3x + 3x Combine like terms: -3x + 3x = 0 -7 + 7x = 21 + 0 -7 + 7x = 21 Add '7' to each side of the equation. -7 + 7 + 7x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 7x = 21 + 7 7x = 21 + 7 Combine like terms: 21 + 7 = 28 7x = 28 Divide each side by '7'. x = 4 Simplifying x = 4
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