It is easier and quicker to answer this question by using the calculator in your computer compared with posting it on WA. But, since you are obviously not capable of carrying out that simple task, the answer is -400.
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15
10x + 3 = 15 10x = 15 - 3 10x = 12 x = 1.2
-10x-6 = -12 -10x = -12+6 -10x = -6 x = 3/5
11x = 10x-19 Subtact 10x fromboth sides:- x = -19
y=-10x-4