book Maths Puzzle Numerical Ability

im so sorry, i was sick and my teacher was gone when i came back, so left out
how would i sipmlify radican 15/49

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please help with this problem: translate the quotient of a number and seven is two into an equation and solve thank-you Can you please help me with these few problems? Thank you very much for your timeand help!

{{{x=2y-4=0}}}
{{{6x-5y+20=0}}}
{{{-2x=2y+5}}}