How much tip should you leave if you want to tip 25% at PF Chang on a $37.99 bill ??
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bearing in mind that standard form for a linear equation means
• all coefficients must be integers, no fractions
• only the constant on the right-hand-side
• all variables on the left-hand-side, sorted
• "x" must not have a negative coefficient
just to point something out, is none of the options, however -x + y = 8, is one, though improper.