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Simplifying 15 + 3x + 1 = 7x Reorder the terms: 15 + 1 + 3x = 7x Combine like terms: 15 + 1 = 16 16 + 3x = 7x Solving 16 + 3x = 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 16 + 3x + -7x = 7x + -7x Combine like terms: 3x + -7x = -4x 16 + -4x = 7x + -7x Combine like terms: 7x + -7x = 0 16 + -4x = 0 Add '-16' to each side of the equation. 16 + -16 + -4x = 0 + -16 Combine like terms: 16 + -16 = 0 0 + -4x = 0 + -16 -4x = 0 + -16 Combine like terms: 0 + -16 = -16 -4x = -16 Divide each side by '-4'. x = 4 Simplifying x = 4
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