15 - ( 2x² - 4x) - (7x - 2x²) =0
15- 2х² +4х-7х+2х²=0
15 + 4х - 7х = 0
15-3х=0
-3х=-15
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15 - ( 2x² - 4x) - (7x - 2x²) =0
15- 2х² +4х-7х+2х²=0
15 + 4х - 7х = 0
15-3х=0
-3х=-15
х=5