Solve for x
x=\frac{4}{35}\approx 0.114285714
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3.5x=0.4
Combine 3x and 0.5x to get 3.5x.
x=\frac{0.4}{3.5}
Divide both sides by 3.5.
x=\frac{4}{35}
Expand \frac{0.4}{3.5} by multiplying both numerator and the denominator by 10.
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