The sum of negative four and five times a number is multiplied by three. The result is 212 less than 7 times the number. What is the number?
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let suppose is xso according to the given condition
3(-4+5*x) = 7*x-212
-12+15*x =7*x -212
15*x-7*x = 212+12
8 *x= 224
x= 28 so the number is 28
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