Настюша636 1) 2(х-3)=42; 2х-6=42; 2х=48; х=24;
2)5(х+7)=3(2х-3); 5х + 35=6х-9; х=44;
3) 2.5(2х+3)=5*4.5; 5х+7.5=37.5; 5х=30; х=6;
4) 0.7(х+3)=0.2(х-2); 0.7х+2.1=0.2х-0.4; 0.5х= -2.5;  х= -5