Решите уравнения 3x-1=2(x-2) 3(x+5)=7-5x 19(y-9)=3(y+7) 4(x-9)=3(x-8)

Question

Решите уравнения
3x-1=2(x-2)
3(x+5)=7-5x
19(y-9)=3(y+7)
4(x-9)=3(x-8)

Answer 1

1. 3x-1=2(x-2)
3x-1=2x-4
3x-2x=-4+1
x=-3
2. 3(x+5)=7-5x
3x+15=7-5x
3x+5x=7-15
8x=-8
x=-1
3. 19(y-9)=3(y+7)
19y-171=3y+21
19y-3y=21+171
16y=192
y=12
4. 4(x-9)=3(x+8)
4x-36=3x+24
4x-3x=24+36
x=60