please tolong bantu aku

a. 6(x–1)=5x–7
6x–6 =5x–7
6x–5x=6–7
1x=–1
x=–1/1
x=–1
b. 5x–12=2(3–x)+10
5x–12=6–2x+10
5x+2x=12+6+10
7x=28
x=28/7
x=4