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x=1
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\frac{2}{5}\times 3x+\frac{2}{5}\times 7=4\left(3-3x\right)+4
Use the distributive property to multiply \frac{2}{5} by 3x+7.
\frac{2\times 3}{5}x+\frac{2}{5}\times 7=4\left(3-3x\right)+4
Express \frac{2}{5}\times 3 as a single fraction.
\frac{6}{5}x+\frac{2}{5}\times 7=4\left(3-3x\right)+4
Multiply 2 and 3 to get 6.
\frac{6}{5}x+\frac{2\times 7}{5}=4\left(3-3x\right)+4
Express \frac{2}{5}\times 7 as a single fraction.
\frac{6}{5}x+\frac{14}{5}=4\left(3-3x\right)+4
Multiply 2 and 7 to get 14.
\frac{6}{5}x+\frac{14}{5}=12-12x+4
Use the distributive property to multiply 4 by 3-3x.
\frac{6}{5}x+\frac{14}{5}=16-12x
Add 12 and 4 to get 16.
\frac{6}{5}x+\frac{14}{5}+12x=16
Add 12x to both sides.
\frac{66}{5}x+\frac{14}{5}=16
Combine \frac{6}{5}x and 12x to get \frac{66}{5}x.
\frac{66}{5}x=16-\frac{14}{5}
Subtract \frac{14}{5} from both sides.
\frac{66}{5}x=\frac{80}{5}-\frac{14}{5}
Convert 16 to fraction \frac{80}{5}.
\frac{66}{5}x=\frac{80-14}{5}
Since \frac{80}{5} and \frac{14}{5} have the same denominator, subtract them by subtracting their numerators.
\frac{66}{5}x=\frac{66}{5}
Subtract 14 from 80 to get 66.
x=\frac{66}{5}\times \frac{5}{66}
Multiply both sides by \frac{5}{66}, the reciprocal of \frac{66}{5}.
x=1
Cancel out \frac{66}{5} and its reciprocal \frac{5}{66}.
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