-40
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If you mean:0 = 800 - 10x + 25 * 20 = 800-10x+25*210x = 800+50x = 8,50 = 800 - 10x + 25 * x * 20 = 800 - 10x + 50x-800 = 40x-50 = x
15
-10x-6 = -12 -10x = -12+6 -10x = -6 x = 3/5
10x + 3 = 15 10x = 15 - 3 10x = 12 x = 1.2
11x = 10x-19 Subtact 10x fromboth sides:- x = -19