book Maths Puzzle Numerical Ability

3x+4y=12

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Dear Sir/Madam,

What is the answer to 3x-4(1-3x)=2x-(x+1)

Thank you for your kind assistance.

Colleen I am having problems with D=RT equations with more than one object.... A bicycle leaves town at 10 mph at 8 a. m. a car leaves at 11 a.m., travling in the same direction at 50 mph.