Решить уравнение:
1) (4-2x)+(5x-3)=(x-2)-(x+3);
2) 4(x-5)+2(3-2x)-1=15x;
3) x^2+5x=0;
4) 4x^2-3x+7=2x^2+x+7
5) x^2+4x+3=0.​
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