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x+x-3-15=x-3+0,85x
0,15x=15 /: 0,15
x=100
2x-x-0,85x=3+15-3
0,15x=15
x=100
x+x+x-0,85x=3+15+3
3x-0,85x=21
2,15x=21:2,15
x=0,13