if a,b,c are positive reals and a+b+c=50 and 3a+b-c=70. if x=5a+4b+2c, find the range of values of x.
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if a,b,c are positive reals and a+b+c=50 and 3a+b-c=70. if x=5a+4b+2c, find the range of values of x.
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