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y = 3x-3
2x + 2*(3x-3) = 66
2x+6x-6 = 66 /+6
8x = 72
x = 9
szerokość 9
długość 3*9-3 = 24
y=szerokość prostokąta
3y=x+3
2x+2y=66
x=3y-3
x+y=33
3y-3+y=33
4y+3=33
4y=36
y=9
x+y=33
x=33-y
x=33-9=24
y=9
x=24