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Simplifying 45 + x = 4x Solving 45 + x = 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. 45 + x + -4x = 4x + -4x Combine like terms: x + -4x = -3x 45 + -3x = 4x + -4x Combine like terms: 4x + -4x = 0 45 + -3x = 0 Add '-45' to each side of the equation. 45 + -45 + -3x = 0 + -45 Combine like terms: 45 + -45 = 0 0 + -3x = 0 + -45 -3x = 0 + -45 Combine like terms: 0 + -45 = -45 -3x = -45 Divide each side by '-3'. x = 15 Simplifying x = 15
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