Linear Equation

Fast trick to solve equation

Q1. 2x + 5 = 9x -4

Formoula -

x = d - b / a-c

where a = 2

b = 5

c = 9

d = -4

x = (-4 - 5) / (2 - 9)

x = -9 / -7

x = 9 / 7

Q2. (x + 1) ( x -7) = (x -5) ( x + 8)

Formoula -

x = cd - ab / a + b - c - d

where a = 1

b = -7

c = -5

d = 8

x = (-5 * 8) - (1 * -7) / (1 + (-7) - (-5 ) - 8)

x = (-40) - (-7) / -9

x = (-33) / -9

x = 11 / 3