exam Maths Puzzle Numerical Ability

I need help on 6r^2+7r=3. I already have 6r^2+7r-3=0. thanks, tyler

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exam Other Question

watermerlons are sold at 60 pesos each and pineapples at 25 pesos each. If a vendor sold at least 1,500 pesos worth of fruit, what is the minimum number of each fruit did he sell? a)x^2-2x=15
B)3x^2+19+1=0
thank you