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Simplifying 7.5 + x = 45 + 3x Solving 7.5 + x = 45 + 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. 7.5 + x + -3x = 45 + 3x + -3x Combine like terms: x + -3x = -2x 7.5 + -2x = 45 + 3x + -3x Combine like terms: 3x + -3x = 0 7.5 + -2x = 45 + 0 7.5 + -2x = 45 Add '-7.5' to each side of the equation. 7.5 + -7.5 + -2x = 45 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + -2x = 45 + -7.5 -2x = 45 + -7.5 Combine like terms: 45 + -7.5 = 37.5 -2x = 37.5 Divide each side by '-2'. x = -18.75 Simplifying x = -18.75
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