640-(15x24-x):0,25=100:1/4

@thumin

@Kimetsu no Yaiba

$640 - (15 × 24 - x) : 0,25 = 100 :$ $\frac{1}{4}$

$640 - (360 - x) :$ $\frac{1}{4}$ $= 100 × 4$

$640 - (360 - x) × 4 = 400$

$(360 - x) × 4 = 640 - 400$

$(360 - x) × 4 = 240$

$360 - x = 240 : 4$

$360 - x = 60$

$x = 360 - 60$

$x = 300$

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