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3\left(1-x\right)+5\left(2-x\right)+5\left(1\times 3+1\right)=0
Multiply both sides of the equation by 15, the least common multiple of 5,3.
3-3x+5\left(2-x\right)+5\left(1\times 3+1\right)=0
Use the distributive property to multiply 3 by 1-x.
3-3x+10-5x+5\left(1\times 3+1\right)=0
Use the distributive property to multiply 5 by 2-x.
13-3x-5x+5\left(1\times 3+1\right)=0
Add 3 and 10 to get 13.
13-8x+5\left(1\times 3+1\right)=0
Combine -3x and -5x to get -8x.
13-8x+5\left(3+1\right)=0
Multiply 1 and 3 to get 3.
13-8x+5\times 4=0
Add 3 and 1 to get 4.
13-8x+20=0
Multiply 5 and 4 to get 20.
33-8x=0
Add 13 and 20 to get 33.
-8x=-33
Subtract 33 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-33}{-8}
Divide both sides by -8.
x=\frac{33}{8}
Fraction \frac{-33}{-8} can be simplified to \frac{33}{8} by removing the negative sign from both the numerator and the denominator.