Answer:
-1
Step-by-step explanation:
-7/10+7/15+1/-20+-9/10+11/15+11/-20
= -7/10 + -9/10 + 7/15 + 11/15 + 1/-20 + 11/-20
= -16/10 + 18/15 + 12/-20
= -8/5 + 6/5 + -3/5
= (-8+6-3)/5
= -5/5
= -1
w = 3(2a + b) - 4
w = 6a + 3b - 4
a = (w - 3b + 4) / 6
-3(-5)+4 =19
-3*-5 = 15
because -*- = +
15+4 = 19
11
