7x+87x7=1463
7x+609=1463
7x=1463-609
7x=854
x=122
4x+2x(22-x)=10
4x+44-2x=10
2x=-34
x=-17
1/2×(3/4-3/8)
=1/2×3/8
=3/16
240×(1/4+1/6)
=240×5/12
=100
7x+87x7=1463
7x+609=1463
7x=1463-609
7x=854
x=122
4x+2x(22-x)=10
4x+44-2x=10
2x=-34
x=-17
1/2×(3/4-3/8)
=1/2×3/8
=3/16
240×(1/4+1/6)
=240×5/12
=100