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x-x=-3-12
0 ≠ -15
układ sprzeczny
b)3x-15+7=x+1
3x-x=1+8
2x=9
x=4,5
3x + 5 +7= x + 1
3x +12= x+1
3x-x =1-12
2x = (-11)|:2
x = - 5.5
A co da a..... to co znaczy *... to jest znak mnożenia ;)
b) 3x - 15 + 7 = x + 1
3x - x = 1 + 8
2x = 9
x = 4,5