Question

If 0.7x = 0.4 + 3.9, then the value of x is 43/7​

Answer 1

$0.7x = 0.4 + 3.9$

$\implies0.7x = 4.3$

$\purple{ \sf{multiplying \: equation \: by \: 10 : }}$

$\implies 10(0.7x) = 10(4.3)$

$\implies 7x= 43$

$\orange{ \therefore x = \frac{43}{7} }$

Answer 2

0.7x=0.4x+3.9

0.7x0.4x=3.9

0.3x=3.9,x=3.9

so, x value is 13