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-3r = 8 - 17
-3r = - 9
r = -9 ÷ -3
r = 3
b. 3 + 4c = 19 - c
4c + c = 19 - 3
5c = 16
c = 16 ÷ 5
c = 3.2
:)
-3r = 8 -17
r = -9 / -3
r = 3
B. 3 + 4c = 19 - c
3 -19 = - c - 4
-16 = -5c
-16 / -5 = c
3,2 = c / c = 3,2