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tpi.. ini gua cma nyri nilai x aja
a. 2x - 5 = 7
2x = 7+5
x = 12/2
x = 6
pembuktian
2.6 - 5 = 7
12 - 5 = 7
7 = 7 (Benar)
b. (gak dapat hasilnya)
c. x² - 9 = 0
x² = 9
x = √9 = 3
pembuktian
3² - 9 = 0
9 - 9 = 0
0 = 0 (Benar)
d. 5x + 2 = 12
5x = 12 - 2
x = 10/5
x = 2
pembuktian
5.2 + 2 = 12
10 + 2 = 12
12 = 12 (Benar)