book Maths Puzzle Numerical Ability

when you have an equation like 1/4x+5=28, and you have to find x, how do you get rid of the fraction?

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i need help with this problem: the number of persons needed to do a job varies directly as the amount of work to be done and inversly as the time in which the job is to be done. If x+5=-9

3=a-7

-2p=22

-c=-24

5m+3-4m=1

4d-6=6

32=-3a+5

2(5-n)=16

4e+2=3e-8

5x+12=7x-4

6R+7-(-2R)=6-3R+12

8(j-6)-4j=12

I would like the steps and a