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(=) 10x + 8 = 15x - 20 + 3
(=) 10x + 8 = 15x - 17
(=) 10x - 15x = -17 - 8
(=) -5x = -25
(=) 5x = 25
(=) x = 25 / 5
x = 5
10x + 8 = 15x - 20 +3
20 + 8 - 3 = 15x - 10x
25 = 5x
x = 5