y=20x-15 y=5x+30
-20x=-15 5x= 30
20x=15 x=30/5
x=15/20 x=6
x=0,75 y= 5*6+30=60
y=20*0,75-15=0
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y=20x-15 y=5x+30
-20x=-15 5x= 30
20x=15 x=30/5
x=15/20 x=6
x=0,75 y= 5*6+30=60
y=20*0,75-15=0