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jdi
10 + 2x + 7x - 21 = 5x - 5
2x + 7x - 5x + 10 - 21 + 5 = 0
4x - 6 = 0
4x = 6
x = 6/4 = 3/2
kalau pindah ruas jadi -\
misal
3x - 2 = 4x +2
jadi
3x - 4x - 2 -2
10 + 2x + 7x - 21 = 5x - 5
9x - 11 = 5x - 5
9x - 5x = 11 - 5
4x = 6
x = 6/4