Solve for x
x=\frac{1}{7}\approx 0.142857143
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0.7x+0.3=0.4
Combine x and -0.3x to get 0.7x.
0.7x=0.4-0.3
Subtract 0.3 from both sides.
0.7x=0.1
Subtract 0.3 from 0.4 to get 0.1.
x=\frac{0.1}{0.7}
Divide both sides by 0.7.
x=\frac{1}{7}
Expand \frac{0.1}{0.7} by multiplying both numerator and the denominator by 10.
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