1. (12х+5)+(7-3х)=3
12х + 5 + 7 - 3х = 3
9х = - 9
х = -1
2. (1-5,1х)-(1,7х+5,4)=1
1 - 5,1х - 1,7х - 5,4 = 1
-6,8х = 5,4
1. (12х+5)+(7-3х)=3
12х + 5 + 7 - 3х = 3
9х = - 9
х = -1
2. (1-5,1х)-(1,7х+5,4)=1
1 - 5,1х - 1,7х - 5,4 = 1
-6,8х = 5,4