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a. 10x + 5 = 7
10x =7-5
10x = 2
x = 2/10
=1/5
b. 10x + 5 = -7
10x = -7-5
10x = -12
x = -12/10
x = -6/5
peny :
10x+5 = 7
10x = 7-5
10x =2
x =2/10
x = 1/5
atau
10x + 5 =-7
10x = -7 - 5
10x = -12
x = -12/10
x = -6/5