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6x+4=-12x+40
18x=36
x=2
6×+4=4[2×-5×+10]
6x+4 = 4[-3x+10]
6x+4 = -12x + 40
6x+12x = 40-4
18x = 36
x = 36/18
x = 18/9
x = 2