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agrupas los términos semejantes :
7x -8 = 3x -10
calcula la suma o resta :
7x - 3x = -10 +8
4x = -2
x = -2/4
x = -1/2
7x - 4x - 2x + 3x = 3 + 5 -10
-2x = -2
luego x = 1