exam Maths Puzzle Numerical Ability

pleas help me solve this equation: b+3(b-1)+2(3-1)=6

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Please help me graph this: f(x)= { 1/2x-5, if x<-2 5x+4, if x>-2 two important reference points for temperature are the boiling point and the freezing point of water. water freezes at 0degreesC or 32degreesF. Water boils at 100degreesC or 212deg