2 X by 7 + X - 1 by 5 is equal to X by 3 + X by 7
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2x /7 + ( x - 1 ) /5 = x / 3 + x /7
( x - 1) /5 = x /3 + x /7 - 2x / 7
( x - 1 ) /5 = x /3 - x/7
x / 5 - 1 /5 =( 7x - 3x) / 7
X /5 = 4x / 7 + 1 / 5
X /5 - 4x /7 = 1 / 5
( 7x - 20x ) / 7 = 1 / 5
- 13 x / 7 = 1 / 5
X = - 7 / 13 * 5 = - 7 / 65.
( x - 1) /5 = x /3 + x /7 - 2x / 7
( x - 1 ) /5 = x /3 - x/7
x / 5 - 1 /5 =( 7x - 3x) / 7
X /5 = 4x / 7 + 1 / 5
X /5 - 4x /7 = 1 / 5
( 7x - 20x ) / 7 = 1 / 5
- 13 x / 7 = 1 / 5
X = - 7 / 13 * 5 = - 7 / 65.
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