Question

Помогите пожалуйста.Номер 2 и 3.Покажите решение тоже

Answer 1

2)
$(13x-15)-(9+6x)=-3x \\ 13x-15-9-6x+3x=0 \\ 10x-24=0 \\ 10x=24 \\ x=2.4$

$12-(4x-18)=(36+4x)+(18-6x) \\ 12-4x+18=36+4x+18-6x \\ 30-4x=54-2x \\ 2x-4x=54-30 \\ -2x=24 \\ x=-12$

$1.6-(x-2.8)=(0.2x+1.5)-0.7 \\ 1.6-x+2.8=0.2x+1.5-0.7 \\ 4.4-x=0.2x+0.8 \\ 4.4-0.8=0.2x+x \\ 3.6=1.2x \\ x=3$

$5(5x-1)-2.7x+0.2x=6.5-0.5x \\ 25x-5-2.7x+0.2x=6.5-0.5x \\ 25x-2.7x+0.2x+0.5x=6.5+5 \\ 23x=11.5 \\ x=0.5$

$(0.5x+1.2)-(3.6x-4.5)=(4.8x-0.3)+(10.5x+0.6) \\ 0.5x+1.2-3.6x+4.5=4.8x-0.3+10.5x+0.6 \\ 0.5x-3.6x-4.8x-10.5x=0.6-0.3-4.5-1.2 \\ -18.4x=-5.4 \\ 18.4x=5.4 \\ x= \frac{27}{92}$

3) $5(x-3)-2(x-7)+7(2x+6)=7 \\ 5x-15-2x+14+14x+42=7 \\ 17x+41=7 \\ 17x=7-41 \\ 17x=-34 \\ x= -2$

$11(y-4)+10(5-3y)-3(4-3y)=-6 \\ 11y-44+50-30y-12+9y=-6 \\ -10y=-6+44+12-50 \\ -10y=0 \\ y=0$

$5(8z-1)-7(4z+1)+8(7-4z)=9 \\ 40z-5-28z-7+56-32z=9 \\ -20z=9+5+7-56 \\ -20z=-35 \\ 20z=35 \\ z=1.75$

$10(3x-2)-3(5x+2)+5(11-4x)=25 \\ 30x-20-15x-6+55-20x=25 \\ 35x=25+20+6-55 \\ 5x=-4 \\ x=-0.8$