4х<span>²+12х-5х-15=4х<span>²+9-12х
4х<span>²+12х-5х-15-4х<span>²-9+12х=0</span></span></span></span>
4x + 1 = 15-x
4x + x = 15 -1
5x = 14
x = 14/5 = 2,8
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0,15х-0,6=9,9-0,3х+0,3
0,45х=10,8
х=24
<span>Log0.5(x+1)+log0.5(x+4)=log0.5 2-1; log0.5(x+1)(x+4)=log0.5 2 - log0.5 0.5;
</span>log0.5(x+1)(x+4)=log0.5 2/0.5; log0.5(x+1)(x+4)=log0.5 4; (x+1)(x+4)=4; x^2+5x+4-4=0; x^2+5x=0; x(x+5)=0; x1 = 0; x2 = -5 - не удовлетворяет уравнение.
Ответ: 0.