7a(a+3b)-2a(3a-4b)=
3x(x+7)-3x(2x-7)===
7a(a+3b)-2a(3a-4b)=7a^{2}+21ab-6a^{2}+8ab=a^{2}+15ab
3x(x+7)-3x(2x-7)=3x^{2}+21-6x^{2}+21= -3x^{2}
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7a(a+3b)-2a(3a-4b)=7a^{2}+21ab-6a^{2}+8ab=a^{2}+15ab
3x(x+7)-3x(2x-7)=3x^{2}+21-6x^{2}+21= -3x^{2}