3+6(x+2)-3(x+4)=4(1+x)+2x
3+6(x+2)-3(x+4)=4(1+x)+2x
$3+6(x+2)-3(x+4)=4(1+x)+2x$
$3+6x+12-3x-12 = 4+4x+2x$
$3x+3 = 4+6x$
$3x-6x = 4-3$
$-3x = 1$
$x= -\dfrac{1}{3}$
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3+6x+12-3x-12=4+4x+2x
3-3x=4
x= - 1/3
3 + 6(x+2) -3(x+4) = 4(1+x) + 2x
3 + 6x + 12 -3x -12 = 4 + 4x +2x
3 - 3x = 4
x = - 1/3