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Simplifying 55 = 7x + 5x + 7 Reorder the terms: 55 = 7 + 7x + 5x Combine like terms: 7x + 5x = 12x 55 = 7 + 12x Solving 55 = 7 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 55 + -12x = 7 + 12x + -12x Combine like terms: 12x + -12x = 0 55 + -12x = 7 + 0 55 + -12x = 7 Add '-55' to each side of the equation. 55 + -55 + -12x = 7 + -55 Combine like terms: 55 + -55 = 0 0 + -12x = 7 + -55 -12x = 7 + -55 Combine like terms: 7 + -55 = -48 -12x = -48 Divide each side by '-12'. x = 4 Simplifying x = 4
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