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y=81
m-12.8=3.2 m=3.2+12.8
m=16
6x+18=138 6x=138-186x=120
x=120/6
x=20
13x=305.5 x=305.5/13x=23,5
3x+ 8=38
3x=38-8
3x=30
x=30/3
x=10
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