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Simplifying 13 + -7x = 8x + 21 Reorder the terms: 13 + -7x = 21 + 8x Solving 13 + -7x = 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. 13 + -7x + -8x = 21 + 8x + -8x Combine like terms: -7x + -8x = -15x 13 + -15x = 21 + 8x + -8x Combine like terms: 8x + -8x = 0 13 + -15x = 21 + 0 13 + -15x = 21 Add '-13' to each side of the equation. 13 + -13 + -15x = 21 + -13 Combine like terms: 13 + -13 = 0 0 + -15x = 21 + -13 -15x = 21 + -13 Combine like terms: 21 + -13 = 8 -15x = 8 Divide each side by '-15'. x = -0.5333333333 Simplifying x = -0.5333333333
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