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Simplifying 3x + -9 + (2x + -4) = 12.3x Reorder the terms: 3x + -9 + (-4 + 2x) = 12.3x Remove parenthesis around (-4 + 2x) 3x + -9 + -4 + 2x = 12.3x Reorder the terms: -9 + -4 + 3x + 2x = 12.3x Combine like terms: -9 + -4 = -13 -13 + 3x + 2x = 12.3x Combine like terms: 3x + 2x = 5x -13 + 5x = 12.3x Solving -13 + 5x = 12.3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12.3x' to each side of the equation. -13 + 5x + -12.3x = 12.3x + -12.3x Combine like terms: 5x + -12.3x = -7.3x -13 + -7.3x = 12.3x + -12.3x Combine like terms: 12.3x + -12.3x = 0.0 -13 + -7.3x = 0.0 Add '13' to each side of the equation. -13 + 13 + -7.3x = 0.0 + 13 Combine like terms: -13 + 13 = 0 0 + -7.3x = 0.0 + 13 -7.3x = 0.0 + 13 Combine like terms: 0.0 + 13 = 13 -7.3x = 13 Divide each side by '-7.3'. x = -1.780821918 Simplifying x = -1.780821918
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