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6x+1=3x-x
6x-3x+x=-1
4x=-1/:4
x=-4
2) 7(1+3x)/2 + 1 = 3(-3+2x)
7+21x+2+1=-9+6x
21x-6x=-9-7-2-1
15x=-19/:15
x=-1 1/15