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3x+2y=20.500
⇔
6x+9y=66.000
6x+4y=41.000
⇔
5y=25.000
y=5.000
3x+2y=20.500
3x+2*5.000=20.500
3x+10.000=20.500
3x=20.500-10.000
3x=10.500
x=3.500