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(a+b)h/2=84
a=2/3b
5/3b=14
b=42/5=8,4
a=5,6
84 = 1/2*(x+2/3x)*12
84 = (x+2/3x)*6
84 = 6x + 4x
10x = 84
x = 8,4cm - dł. jednej podstawy
2/3*8,4 = 5,6cm - dł. drugiej podstawy