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Simplifying 400 = 3x + x Combine like terms: 3x + x = 4x 400 = 4x Solving 400 = 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. 400 + -4x = 4x + -4x Combine like terms: 4x + -4x = 0 400 + -4x = 0 Add '-400' to each side of the equation. 400 + -400 + -4x = 0 + -400 Combine like terms: 400 + -400 = 0 0 + -4x = 0 + -400 -4x = 0 + -400 Combine like terms: 0 + -400 = -400 -4x = -400 Divide each side by '-4'. x = 100 Simplifying x = 100
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