book Maths Puzzle Numerical Ability

How do you solve these problems? z/20+1/12=z/15-1/10 and 4w+23/5=19-w/7

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Shut your eyes and try to imagine a perfect ice cube. If you�re good at visualizing, you may be able to �see� the edges and faces that are positioned on the far side of the cube. would you pleas walk me threw this problem 3(1+4n)- 2(5n-3)=25