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Simplifying 30 + -5x = 40 + -9x Solving 30 + -5x = 40 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. 30 + -5x + 9x = 40 + -9x + 9x Combine like terms: -5x + 9x = 4x 30 + 4x = 40 + -9x + 9x Combine like terms: -9x + 9x = 0 30 + 4x = 40 + 0 30 + 4x = 40 Add '-30' to each side of the equation. 30 + -30 + 4x = 40 + -30 Combine like terms: 30 + -30 = 0 0 + 4x = 40 + -30 4x = 40 + -30 Combine like terms: 40 + -30 = 10 4x = 10 Divide each side by '4'. x = 2.5 Simplifying x = 2.5
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