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3a - b = -11 | x4
12a + 15b = -6
12a - 4b = -44
---------------------- -
19b = 38
b = 38 : 19
b = 2
4a + 5.2 = -2
4a + 10 = -2
4a = -12
a = -12 : 4
a = -3
3a - 2b
3.-3 - 2.2
-9 - 4
-13