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Simplifying 7 + -8x = 8x + 21 Reorder the terms: 7 + -8x = 21 + 8x Solving 7 + -8x = 21 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. 7 + -8x + -8x = 21 + 8x + -8x Combine like terms: -8x + -8x = -16x 7 + -16x = 21 + 8x + -8x Combine like terms: 8x + -8x = 0 7 + -16x = 21 + 0 7 + -16x = 21 Add '-7' to each side of the equation. 7 + -7 + -16x = 21 + -7 Combine like terms: 7 + -7 = 0 0 + -16x = 21 + -7 -16x = 21 + -7 Combine like terms: 21 + -7 = 14 -16x = 14 Divide each side by '-16'. x = -0.875 Simplifying x = -0.875
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