book Maths Puzzle Numerical Ability

1/6+3n=7/24+n

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how do i do this problem, step by step 4(x+8)<6x+20 please help it say use the substitution method to solve the linear system

x+2y=-5
4x-3y=2


32-2y=4
x+ 3y=5


3x+y= -2
x+3y=2