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3x+\left(2-3x\right)^{2}+3x\left(1-x\right)+4\left(1+5x\right)=6x\left(3+x\right)-5\left(x-2\right)
Multiply both sides of the equation by 30, the least common multiple of 10,30,15,5,6.
3x+4-12x+9x^{2}+3x\left(1-x\right)+4\left(1+5x\right)=6x\left(3+x\right)-5\left(x-2\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2-3x\right)^{2}.
-9x+4+9x^{2}+3x\left(1-x\right)+4\left(1+5x\right)=6x\left(3+x\right)-5\left(x-2\right)
Combine 3x and -12x to get -9x.
-9x+4+9x^{2}+3x-3x^{2}+4\left(1+5x\right)=6x\left(3+x\right)-5\left(x-2\right)
Use the distributive property to multiply 3x by 1-x.
-6x+4+9x^{2}-3x^{2}+4\left(1+5x\right)=6x\left(3+x\right)-5\left(x-2\right)
Combine -9x and 3x to get -6x.
-6x+4+6x^{2}+4\left(1+5x\right)=6x\left(3+x\right)-5\left(x-2\right)
Combine 9x^{2} and -3x^{2} to get 6x^{2}.
-6x+4+6x^{2}+4+20x=6x\left(3+x\right)-5\left(x-2\right)
Use the distributive property to multiply 4 by 1+5x.
-6x+8+6x^{2}+20x=6x\left(3+x\right)-5\left(x-2\right)
Add 4 and 4 to get 8.
14x+8+6x^{2}=6x\left(3+x\right)-5\left(x-2\right)
Combine -6x and 20x to get 14x.
14x+8+6x^{2}=18x+6x^{2}-5\left(x-2\right)
Use the distributive property to multiply 6x by 3+x.
14x+8+6x^{2}=18x+6x^{2}-5x+10
Use the distributive property to multiply -5 by x-2.
14x+8+6x^{2}=13x+6x^{2}+10
Combine 18x and -5x to get 13x.
14x+8+6x^{2}-13x=6x^{2}+10
Subtract 13x from both sides.
x+8+6x^{2}=6x^{2}+10
Combine 14x and -13x to get x.
x+8+6x^{2}-6x^{2}=10
Subtract 6x^{2} from both sides.
x+8=10
Combine 6x^{2} and -6x^{2} to get 0.
x=10-8
Subtract 8 from both sides.
x=2
Subtract 8 from 10 to get 2.