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Simplifying (12 + -0.4x) + 0.7x = 15 Remove parenthesis around (12 + -0.4x) 12 + -0.4x + 0.7x = 15 Combine like terms: -0.4x + 0.7x = 0.3x 12 + 0.3x = 15 Solving 12 + 0.3x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 0.3x = 15 + -12 Combine like terms: 12 + -12 = 0 0 + 0.3x = 15 + -12 0.3x = 15 + -12 Combine like terms: 15 + -12 = 3 0.3x = 3 Divide each side by '0.3'. x = 10 Simplifying x = 10
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