-1x(3-4+x)=-7
-3+4-x=-7
1-x=-7
-x=-7+1
-x=-6 / x (-1)
x=6
❤
1-2×[3-(4-x)]=-7
-1×(3-4+x)=-7
-1×(-1+x)=-7
1-x=-7 / -1
-x=-6 / × (-1)