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x-15=0,85x-2,55
x-0,85x=-2,55+15
0,15x=12,45/:(0,15)
x=83
x-15=0,85x-2,55
x-0,85x=-2,55+15
0,15x=12,45/:(0,15)
x=83
ale nie jestem pewna czy jest dobrze :)