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Simplifying 12 + -3(4 + 1.3) = 4x Combine like terms: 4 + 1.3 = 5.3 12 + -3(5.3) = 4x Multiply -3 * 5.3 12 + -15.9 = 4x Combine like terms: 12 + -15.9 = -3.9 -3.9 = 4x Solving -3.9 = 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -3.9 + -4x = 4x + -4x Combine like terms: 4x + -4x = 0 -3.9 + -4x = 0 Add '3.9' to each side of the equation. -3.9 + 3.9 + -4x = 0 + 3.9 Combine like terms: -3.9 + 3.9 = 0.0 0.0 + -4x = 0 + 3.9 -4x = 0 + 3.9 Combine like terms: 0 + 3.9 = 3.9 -4x = 3.9 Divide each side by '-4'. x = -0.975 Simplifying x = -0.975
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