I)x-1 by 4=3
ii)3x+6 by 2=3 by 2
iii)3x-1by5=2x+3by7

i) x = 13

ii) x = -1

iii) x = 2

Explanation:

Given the following expressions, we are to find the corresponding value of x.

1) x-1 by 4=3

x-1/4=3

Cross multiply

x-1 = 4*3

x-1 = 12

x = 12+1

x = 13

2) Given 3x+6 by 2 = 3 by 2

3x+6/2=3/2

Cross multiply

2(3x+6) = 2(3)

2(3x) + 2(6) = 6

6x + 12 = 6

6x = 6-12

6x = -6

x = -6/6

x = -1

3) 3x-1by5=2x+3by7

This can also be written as:

(3x-1)/5 = (2x+3)/7

Cross multiply

7(3x-1) = 5(2x+3)

Open the bracket

7(3x) - 7(1) = 5(2x) + 5(3)

21x - 7 = 10x + 15

Collect like terms

21x - 10x = 15 + 7

11x = 22

x = 22/11

x = 2

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