3х+5+(х+5)=7х+3
3х+5+х+5=7х+3
4х+5+5=7х+3
4х+10=7х+3
4x-7x+10=3
4x-7x=3-10
-3x=3-10
-3x=-7
x=7/3\
3х+5+(х+5)=7х+3
3х+5+х+5=7х+3
4х+5+5=7х+3
4х+10=7х+3
4x-7x+10=3
4x-7x=3-10
-3x=3-10
-3x=-7
x=7/3\