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(5z+3)-(2z-7)=5z-2z+3+7= 3z+10
(2y+15z)-(4y-8)=2y-4y+15z+8= -2y+15z+8
NB : kalo ada kata" dari dalam pengurangan berarti harus dibalik
> 5z+3 oleh 2z-7
(5z+3)-(2z-7)= 5z-2z+3+7=3z+10