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• Identical expressions

• six *(seven + two *x) = zero
• 6 multiply by (7 plus 2 multiply by x) equally 0
• six multiply by (seven plus two multiply by x) equally zero
• 6(7 + 2x) = 0
• 67 + 2x = 0

• Similar expressions

• 6*(7 - 2*x) = 0