What is the answer to 5x+3(3x+1)=21 ?

The answer to 5x+3(3x+1)=21 is x= 9/7

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5x+3(3x+1)=21

5 x + 3 (3 x + 1) = 21

x = \frac{9}{7}

Decimal Notation

x = 1.28571 \dots

Solution steps

5 x + 3 (3 x + 1) = 21

Expand

3 (3 x + 1) : 9 x + 3

5 x + 9 x + 3 = 21

Add similar elements:

5 x + 9 x = 14 x

14 x + 3 = 21

Move

3

to the right side

14 x = 18

Divide both sides by

14

x = \frac{9}{7}

\frac{3}{4} x + \frac{1}{4} x - 0.2 = (\frac{1}{5})^{2}

100 - 3 x = 5 x - 28

\frac{3 x}{4} = 24

\frac{1}{3} x + \frac{1}{4} x + \frac{1}{3} x + 8 = x

26.81 = \frac{1}{2} (- 9.8) (4)^{2} + v (4) + 0.5