15(z-4)-2(z-9)+5(z-6)=60
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15z-60-2z+18+5z-30=60
18z=60+60+30-18
18z=120+12
18z=132
z=132/18
18z=60+60+30-18
18z=120+12
18z=132
z=132/18
Dm1234:
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