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Anonymous
v is -15... -15*2 = -30... -30+11= -19.
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(-11) + (+19) = -11 + 19 = 8
-8 + 19 = 11
The Abelian (commutative) property of integers under addition.
7.5
x=2.75 This follows from the equation (4x - 3) + 11 = 19 and 4x = 11