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5x = 20+5
5x = 25
x = 5 (a)
6) 3(x+2)+5 = 2(x+15)
3x + 6 + 5 = 2x +30
3x +11 = 2x +30
3x-2x = 30-11
x = 19 (c)
5x = 20 + 5 (mudahnya 5 itu dipindah ruas, lalu yang asalnya positif jadi negatif, begitupun sebaliknya)
5x = 25
x = 25/5
x = 5
6. 3(x+2) + 5 = 2(x+15)
3x + 6 +5 = 2x + 30
3x + 11 = 2x + 30
3x - 2x = 30 - 11
x = 19
nilai (x + 2) = 19 + 2
= 21