11a+9 = 4a+30
11a-4a = 30-9
7a = 21
Solution: a = 3
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45 = 30 + m Subtract 30 from both sides: 15 = m
v is -15... -15*2 = -30... -30+11= -19.
90+x+72+30 = 180. If you add 90+72+30, you get 192. But to get 180 you have to subtract 12. 90+(-12)+72+30 =180 if x is -12
x2 + 13x = -30 ∴ x2 + 13x + 30 = 0 ∴ (x + 3)(x + 10) = 0 ∴ x ∈ {-3, -10}
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