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30%x + 40%x = 79
30%(x + y) = 66
b)
90%x = 3 + y
110%y = x - 6
c)
x = 20%y
80%x = y - 21
d)
x = 110%y
y - 2 = 90%x
0.3(x+y) = 66
0.9x = y+3
1.1y = x-6
x = 0.2y
0.8x = y-21
x = 1.1y
y-2 = 0.9x