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a. 56 = (n + 5) × 7
56 = 7n + 35
7n = 56 + 35
7n = 91
n = 13
b. (6x + 10) - (14x - 6) = x + 7
6x - 14x + 10 + 6 = x + 7
-8x + 16 = x + 7
-8x - x = 7 - 16
-9x = -9
x = 1
c. (2x + 3) / 5 = (x - 1) / 3
3(2x + 3) = 5(x - 1)
6x + 9 = 5x - 5
6x - 5x = -5 - 9
x = -14
maaf lamaa :)
56 = 7 (n-5)
56 = 7n - 35
56 +35 = 7n
91 = 7n
91/7 = n
13 = n
b. 2(3x + 5) - 2(7x-3) =x + 7
6x +10 - 14x + 6 = x + 7
-8x +16 = x + 7
16 - 7 = x+8x
9 = 9x
1 = x
c. (2x+3)/5 = (x-1)/3
3(2x+3) = 5 (x-1)
6x +9 = 5x - 5
6x-5x = -5 -9
x = -14
semoga membantu:)