book Maths Puzzle Numerical Ability

-9x+15=-22-4(x+12)
-9x+15=-22-4x+48
-9x+15=4x+26
15=5x+26
-11=5x
-2.2=x

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solve the linear system- if the system is inconsistent or dependent, so state...

x/6 + y/3 = 8 would you pleas walk me threw this problem 3(1+4n)- 2(5n-3)=25