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Simplifying -99 + -7x = 21 + 8x Solving -99 + -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. -99 + -7x + -8x = 21 + 8x + -8x Combine like terms: -7x + -8x = -15x -99 + -15x = 21 + 8x + -8x Combine like terms: 8x + -8x = 0 -99 + -15x = 21 + 0 -99 + -15x = 21 Add '99' to each side of the equation. -99 + 99 + -15x = 21 + 99 Combine like terms: -99 + 99 = 0 0 + -15x = 21 + 99 -15x = 21 + 99 Combine like terms: 21 + 99 = 120 -15x = 120 Divide each side by '-15'. x = -8 Simplifying x = -8
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