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x-15=0,85x-2,55
x-0,85x=-2,55+15
0,15x=12,45
x=12,45:0,15
x=83
x- 0,85x= -2,55 + 15
0,15x=12,45
x=83
x-15=0,85x-2,55
x-0,25x=-2,55+15
0,15x=12,45//0,15
x=83