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__+__-0.8(x-3)-1
4 2
2x 1
__+__-(0.8x-2,4)-1
4 2
2x 1
__+__ +0.8x+2,4-1 (obie strony mnożymy przez 8)
4 2
4x+4+6,4x+19,2-8
10,4x= -4-19,2+8
10,4x= -15,2
x= - 1,46