Уравнения 99 баллов!!!!

1) -2x=-4
2) -2/5y=3/10
3) -5y+7=42
4) 8y-(7y-142)=51
5) (6y+1)-(3-2y)=14

1)-2x=-4x=4/2x=22)-2/5y=3/10-2/5y=0,3-y=5/2*0,3-y=5/2*3/10-y=1/2*1/3-y=3/4y=-3/43)-5y+7=42-5y=42-7-5y=35y=-74)8y-(7y-142)=528y-7y+142=52y+142=52y=51-142y=-915)(6y+1)-(3-2y)=146y+1-3+2y=148y-2=148y=14+28y=16y=2