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Simplifying 40 + -7x = 12 + 3x Solving 40 + -7x = 12 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 40 + -7x + -3x = 12 + 3x + -3x Combine like terms: -7x + -3x = -10x 40 + -10x = 12 + 3x + -3x Combine like terms: 3x + -3x = 0 40 + -10x = 12 + 0 40 + -10x = 12 Add '-40' to each side of the equation. 40 + -40 + -10x = 12 + -40 Combine like terms: 40 + -40 = 0 0 + -10x = 12 + -40 -10x = 12 + -40 Combine like terms: 12 + -40 = -28 -10x = -28 Divide each side by '-10'. x = 2.8 Simplifying x = 2.8
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