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50=2*(x+7)+(x-2)
50=2*(2x+5)
50=4x+10
50-10=4x
40=4x
x=40/4
x=10cm
p=x+7
=10+7=17cm
l=x-2
=10-2=8cm
Luas=p*l
=17*8
=136cm²