exam Maths Puzzle Numerical Ability

I need some help. Can anyone tell me what the solution is to this problem using substitution?
y=-2/3x+4
2x+3y=-6

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exam Other Question

0.3 (4 + 2X)
- 0.1 (X +2)
= 0

Please tell me what X is/ The value of X.

Thanks.

Solve the open sentence and graph the solution set.

|6r+8|<-4