exam Maths Puzzle Numerical Ability

1. 7x+6=3x+50
2. 6x+1=4x+15
3. 3x+2=-7+4x
4. 7x+10=26+5x

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please help me in this
let x have the p.d.f f(x)= (x+2)/18 , -2 The textbook is for an online math class, Math 200. It is caled Finite Mathematics 8th edition, by Margaret L. Lial.Raymond N.Greenwell,and Nathan P. Ritchie published by Addison