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150-5\times 5\left(1+x\right)+3\left(3x+1\right)=0
Multiply both sides of the equation by 15, the least common multiple of 3,5.
150-25\left(1+x\right)+3\left(3x+1\right)=0
Multiply -5 and 5 to get -25.
150-25-25x+3\left(3x+1\right)=0
Use the distributive property to multiply -25 by 1+x.
125-25x+3\left(3x+1\right)=0
Subtract 25 from 150 to get 125.
125-25x+9x+3=0
Use the distributive property to multiply 3 by 3x+1.
125-16x+3=0
Combine -25x and 9x to get -16x.
128-16x=0
Add 125 and 3 to get 128.
-16x=-128
Subtract 128 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-128}{-16}
Divide both sides by -16.
x=8
Divide -128 by -16 to get 8.