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0.4\left(7x-1\right)=4
Variable x cannot be equal to \frac{1}{7} since division by zero is not defined. Multiply both sides of the equation by 2\left(7x-1\right).
2.8x-0.4=4
Use the distributive property to multiply 0.4 by 7x-1.
2.8x=4+0.4
Add 0.4 to both sides.
2.8x=4.4
Add 4 and 0.4 to get 4.4.
x=\frac{4.4}{2.8}
Divide both sides by 2.8.
x=\frac{44}{28}
Expand \frac{4.4}{2.8} by multiplying both numerator and the denominator by 10.
x=\frac{11}{7}
Reduce the fraction \frac{44}{28} to lowest terms by extracting and canceling out 4.