6. (a) $$ 2 x^{2}+2 x+3 x^{2}+5 x $$ (b) $$ 3 m^{2}+2 m+4 m^{2}-3 m $$ (c) $$ -8 q^{2}-3+4 q^{2}-q $$

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Calculate or simplify the expression $$ 2x^2+2x+3x^2+5x $$.
Simplify the expression by following steps:
- step0: Solution:
  $$2x^{2}+2x+3x^{2}+5x$$
- step1: Add the terms:
  $$5x^{2}+7x$$
Calculate or simplify the expression $$ 3m^2+2m+4m^2-3m $$.
Simplify the expression by following steps:
- step0: Solution:
  $$3m^{2}+2m+4m^{2}-3m$$
- step1: Add the terms:
  $$7m^{2}-m$$
Calculate or simplify the expression $$ -8q^2-3+4q^2-q $$.
Simplify the expression by following steps:
- step0: Solution:
  $$-8q^{2}-3+4q^{2}-q$$
- step1: Add the terms:
  $$-4q^{2}-3-q$$
The simplified expressions are:
(a) $$5x^{2}+7x$$
(b) $$7m^{2}-m$$
(c) $$-4q^{2}-3-q$$
Simplify the expressions: (a) $$5x^{2}+7x$$ (b) $$7m^{2}-m$$ (c) $$-4q^{2}-3-q$$

(a)
(b)
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