Answer:
5
Step-by-step explanation:
a = 3; b = -2
a - b = 3 - (-2) = 3 + 2 = 5
x=3
5x + 4 = 19
-4 -4
5x = 15
/5 /5
x = 3
the answer is 8/3
-2/3 ÷ 1/-4
-2/3 × -4/1
8/3
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