(1-40%)x+30=75%x
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(1-40%)x+30=75%x
(1-40%)x+30=75%x
(1-40%)x+30=75%x
0.6x+30=0.75x
0.15x=30
x=200
(1-40%)x+30=75%x
0.6x+30=0.75x
30=0.75x-0.6x
30=0.15x
x=200
(1-40%)x+30=75%x
(1-40%)x+30=75%x
(1-40%)x+30=75%x
0.6x+30=0.75x
0.15x=30
x=200
(1-40%)x+30=75%x
0.6x+30=0.75x
30=0.75x-0.6x
30=0.15x
x=200