(3+5)*6-8/1+3*3+2=

You need to add more parentheses or brackets to make it clear what the numerator and denominator are for that "/" fraction.

3/5 * 2/3 + 15/7 * 21/20=

the are fractions

That is not the the same as what you wrote first

[3/5 * 2/3] + [15/7 * 21/20]
= (2/5) + 3*(3/4) = 2/5 + 9/4
= 8/20 + 45/20 = 53/20 = 2.65

To solve this equation, let's proceed step by step using the order of operations (also known as PEMDAS or BODMAS):

Step 1: Parentheses
There are no parentheses in the equation, so we can move on to the next step.

Step 2: Exponents
There are no exponents in the equation.

Step 3: Multiplication and Division (from left to right)
First, we have (3+5)*6. Adding 3 and 5 gives us 8, then we multiply it by 6, resulting in 48.
Next, we have 8/1, which is simply 8.

Step 4: Addition and Subtraction (from left to right)
Now we can combine the results obtained from the previous step with the rest of the equation:
48 - 8 + 3 * 3 + 2

Continuing with the addition and subtraction from left to right:
48 - 8 = 40
40 + 3 = 43
43 * 3 = 129
129 + 2 = 131

Therefore, the value of (3+5)*6-8/1+3*3+2 is equal to 131.