4x-(7x-2)=17
4x-7x+2=17
-3x=17-2
x=15/3
х=5
проверка:
4*5-(7*5-2)=17
20-35+2=17
15+2=17
x/2=x/4 + 8
x/2=x/4+ (4*8)/4
x/2 = x+4*8/4
x/2=x+32/4 /*2(сокращаем)
2x=x+32
2x-x=x+32-x
x=x+32=x
x=32
п:
32/2=32/4+8
16=8+8
4x-(7x-2)=17
4x-7x+2=17
-3x=17-2
x=15/3
х=5
проверка:
4*5-(7*5-2)=17
20-35+2=17
15+2=17
x/2=x/4 + 8
x/2=x/4+ (4*8)/4
x/2 = x+4*8/4
x/2=x+32/4 /*2(сокращаем)
2x=x+32
2x-x=x+32-x
x=x+32=x
x=32
п:
32/2=32/4+8
16=8+8