1 - 4 \cdot ( 3 x + 7,8 ) = 0
Solve for x
x=-\frac{151}{60}\approx -2,516666667
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1-12x-31,2=0
Use the distributive property to multiply -4 by 3x+7,8.
-30,2-12x=0
Subtract 31,2 from 1 to get -30,2.
-12x=30,2
Add 30,2 to both sides. Anything plus zero gives itself.
x=\frac{30,2}{-12}
Divide both sides by -12.
x=\frac{302}{-120}
Expand \frac{30,2}{-12} by multiplying both numerator and the denominator by 10.
x=-\frac{151}{60}
Reduce the fraction \frac{302}{-120} to lowest terms by extracting and canceling out 2.
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