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Simplifying 2x + -7 + -8x = 2x + 21 Reorder the terms: -7 + 2x + -8x = 2x + 21 Combine like terms: 2x + -8x = -6x -7 + -6x = 2x + 21 Reorder the terms: -7 + -6x = 21 + 2x Solving -7 + -6x = 21 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -7 + -6x + -2x = 21 + 2x + -2x Combine like terms: -6x + -2x = -8x -7 + -8x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 -7 + -8x = 21 + 0 -7 + -8x = 21 Add '7' to each side of the equation. -7 + 7 + -8x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + -8x = 21 + 7 -8x = 21 + 7 Combine like terms: 21 + 7 = 28 -8x = 28 Divide each side by '-8'. x = -3.5 Simplifying x = -3.5
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