Question

3 upon 10 X + 12 is equal to 4 upon 10 x minus 28​

Answer 1

Answer:

3x/10-4x/10=-28-12

Step-by-step explanation:

x/10=40

x=400

Answer 2

3/10x + 12 = 4/10x - 28

3/10x + 120x/10x = 4/10x - 280x/10x

(Cross multiplication)

10x(3+120x) = 10x(4-280x)

30x+1200x² = 40x-2800x²

2800x²-1200x² = 40x-30x

1600x² = 10x

1600x²/10 = x

160x² = x

160 = x³

12.64(approx) = x