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7x-3x = 12+8
4x = 20
x = 5
x+2 = 5+2
= 7
pindah ruas
7x - 3x = 12 - (-8)
4x = 12 + 8
4x = 20
x = 5
maka nilai dari x + 2
= 5 + 2 = 7