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Simplifying 15 + -3 = 3x + x Combine like terms: 15 + -3 = 12 12 = 3x + x Combine like terms: 3x + x = 4x 12 = 4x Solving 12 = 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. 12 + -4x = 4x + -4x Combine like terms: 4x + -4x = 0 12 + -4x = 0 Add '-12' to each side of the equation. 12 + -12 + -4x = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -4x = 0 + -12 -4x = 0 + -12 Combine like terms: 0 + -12 = -12 -4x = -12 Divide each side by '-4'. x = 3 Simplifying x = 3
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