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a*b
x+2x=12cm2
3x=12cm2 /:3
x=4cm2
x=4cm
2x=4*2=8cm
2x=y
x+y=12
2x-y=0
3x=12/:3
x=4
x=4
4+y=12
x=4
y=12-4
x=4
y=8