Помогите с математикой номер 485

Question

Помогите с математикой номер 485

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Answer 1

1:
3(х+5)+4х=3х+15+4х=7х+15;
2:
8(7+х)-3х=56+8х-3х=58+5х;
3:
9(х-7)+6х=9х-63+6х=15х-63;
4:
5(х+8)-11=5х+40-11=5х+29;
5:
2(13+х)-15=26+2х-15=2х+11
6:
6(х+5)+2х=6х+30+2х=8х+30