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An equation containing one of the highest power of the unknown quantity is called a linear equation or first- degree equation.

a x + b = 0, a ≠ 0 is an example of linear equation.

Constant 4 is there on L.H.S., so we can subtract 4 from both sides to remove 4 from L.H.S., and then we get

2 x = 8 – 4

2 x = 4

Step 2: - Try to free the coefficients from the variable. So we will divide both sides by 2 so that coefficient of 2 will be remove from both sides.

2 x / 2 = 4 / 2

x = 2

Therefore x = 2

6 x = 9 + 3

6 x = 12

x = 12 / 6

x = 2