Question 185616
9D+18M=630 MULTIPLY BY -1 & ADD THESE 2 EQUATIONS.
9D+27M=720
-9D-18M=-630
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9M=90
M=90/9
M=$10 FOR EACH MEAL.
9D+18*10=630
9D+180=630
9D=630-180
9D=450
D=450/9
D=$50 PER DAY.