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100(4/10)+100(25/100)x=-200
40+25x=-200
25x=-200-40
25x=-240
x=-9i15/25
x=-9i3/5
0,2x+0,3=0,5/*10
10(2/10)x+10(3/10)=10(5/10)
2x+3=5
2x=5-3
2x=2
x=1
2,1-0,3x=0,4x/*10
10(21/10)-10(3/10)x=10(4/10)x
21-3x=4x
-3x-4x=-21
-7x=-21
x=3
-1,5x-3=0,2x+6/*10
10(-15/10)x-30=10(2/10)x+60
-15x-30=2x+60
-15x-2x=60+30
-17x=90
x=-5i5/17