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2. a. x-2x<3+2 = -x<5 = x>5
b. 5+4-3x<10 = -3x<-5-4+10 = -3x<1 = x>1/3
3. 3x-2y=12 x4 -> 12x - 8y=48
4x+y=5 x3 -> 12x + 3y=15
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-11y = 33
y = -3
3x -2(-3)=12
3x = 12-6
x = 2