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6/12x+4/12x+3/12x+2/12x+1/12x-x-4/12x=2-2
0=0
b)3{3(3x-4)-4}-7=-2{-2(-2x+5)+5=
27x-8x=55-10
19x=45
x=2,368
d) -2(2x+4)+4(4x+8)=2(8x+4)-4(x-4)
-4x+16x-16x+4x=-32+8+8+16
0=0